diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 50299e13..259a6341 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -4,7 +4,7 @@ pool:
 steps:
 - task: NodeTool@0
   inputs:
-    versionSpec: '8.x'
+    versionSpec: '12.x'
 
 - task: Npm@1
   displayName: 'npm ci'
@@ -14,8 +14,22 @@ steps:
     customCommand: 'ci'
 
 - task: Npm@1
-  displayName: 'npm test'
+  displayName: 'npm test chrome'
   inputs:
     workingDir: ./tests/
     command: custom
     customCommand: 'run test:ci'
+
+- task: Bash@3
+  displayName: 'npm install puppeteer firefox'
+  inputs:
+    targetType: 'inline'
+    workingDirectory: ./tests/
+    script: PUPPETEER_PRODUCT=firefox npm install puppeteer@3.0.0
+
+- task: Bash@3
+  displayName: 'npm test firefox'
+  inputs:
+    targetType: 'inline'
+    workingDirectory: ./tests/
+    script: PUPPETEER_PRODUCT=firefox npm run test:ci
diff --git a/tests/package-lock.json b/tests/package-lock.json
index b541b998..13036ad7 100644
--- a/tests/package-lock.json
+++ b/tests/package-lock.json
@@ -457,6 +457,19 @@
         "@types/istanbul-lib-report": "*"
       }
     },
+    "@types/mime-types": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.0.tgz",
+      "integrity": "sha1-nKUs2jY/aZxpRmwqbM2q2RPqenM=",
+      "dev": true
+    },
+    "@types/node": {
+      "version": "13.13.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-13.13.0.tgz",
+      "integrity": "sha512-WE4IOAC6r/yBZss1oQGM5zs2D7RuKR6Q+w+X2SouPofnWn+LbCqClRyhO3ZE7Ix8nmFgo/oVuuE01cJT2XB13A==",
+      "dev": true,
+      "optional": true
+    },
     "@types/stack-utils": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/@types/stack-utils/-/stack-utils-1.0.1.tgz",
@@ -478,6 +491,16 @@
       "integrity": "sha512-gCubfBUZ6KxzoibJ+SCUc/57Ms1jz5NjHe4+dI2krNmU5zCPAphyLJYyTOg06ueIyfj+SaCUqmzun7ImlxDcKg==",
       "dev": true
     },
+    "@types/yauzl": {
+      "version": "2.9.1",
+      "resolved": "https://registry.npmjs.org/@types/yauzl/-/yauzl-2.9.1.tgz",
+      "integrity": "sha512-A1b8SU4D10uoPjwb0lnHmmu8wZhR9d+9o2PKBQT2jU5YPTKsxac6M2qGAdY7VcL+dHHhARVUDmeg0rOrcd9EjA==",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "@types/node": "*"
+      }
+    },
     "@wordpress/jest-puppeteer-axe": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/@wordpress/jest-puppeteer-axe/-/jest-puppeteer-axe-1.3.0.tgz",
@@ -524,13 +547,10 @@
       "dev": true
     },
     "agent-base": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
-      "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
-      "dev": true,
-      "requires": {
-        "es6-promisify": "^5.0.0"
-      }
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
+      "integrity": "sha512-TMeqbNl2fMW0nMjTEPOwe3J/PRFP4vqeoNuQMG0HlMrtm5QxKqdvAkZ1pRBQ/ulIyDD5Yq0nJ7YbdD8ey0TO3g==",
+      "dev": true
     },
     "ajv": {
       "version": "6.10.2",
@@ -784,6 +804,12 @@
         }
       }
     },
+    "base64-js": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.1.tgz",
+      "integrity": "sha512-mLQ4i2QO1ytvGWFWmcngKO//JXAQueZvwEKtjgQFM4jIK0kU+ytMfplL8j+n5mspOfjHwoAg+9yhb7BwAHm36g==",
+      "dev": true
+    },
     "bcrypt-pbkdf": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.2.tgz",
@@ -793,6 +819,25 @@
         "tweetnacl": "^0.14.3"
       }
     },
+    "bl": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.0.2.tgz",
+      "integrity": "sha512-j4OH8f6Qg2bGuWfRiltT2HYGx0e1QcBTrK9KAHNMwMZdQnDZFk0ZSYIpADjYCB3U12nicC5tVJwSIhwOWjb4RQ==",
+      "dev": true,
+      "requires": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      },
+      "dependencies": {
+        "inherits": {
+          "version": "2.0.4",
+          "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.4.tgz",
+          "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
+          "dev": true
+        }
+      }
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -864,6 +909,22 @@
         "node-int64": "^0.4.0"
       }
     },
+    "buffer": {
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.6.0.tgz",
+      "integrity": "sha512-/gDYp/UtU0eA1ys8bOs9J6a+E/KWIY+DZ+Q2WESNUA0jFRsJOc0SNUO6xJ5SGA1xueg3NL65W6s+NY5l9cunuw==",
+      "dev": true,
+      "requires": {
+        "base64-js": "^1.0.2",
+        "ieee754": "^1.1.4"
+      }
+    },
+    "buffer-crc32": {
+      "version": "0.2.13",
+      "resolved": "https://registry.npmjs.org/buffer-crc32/-/buffer-crc32-0.2.13.tgz",
+      "integrity": "sha1-DTM+PwDqxQqhRUq9MO+MKl2ackI=",
+      "dev": true
+    },
     "buffer-from": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
@@ -925,6 +986,12 @@
         "supports-color": "^5.3.0"
       }
     },
+    "chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
+      "dev": true
+    },
     "ci-info": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-2.0.0.tgz",
@@ -1030,18 +1097,6 @@
       "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
       "dev": true
     },
-    "concat-stream": {
-      "version": "1.6.2",
-      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.2.tgz",
-      "integrity": "sha512-27HBghJxjiZtIk3Ycvn/4kbJk/1uZuJFfuPEns6LaEvpvG1f0hTea8lilrouyo9mVc2GWdcEZ8OLoGmSADlrCw==",
-      "dev": true,
-      "requires": {
-        "buffer-from": "^1.0.0",
-        "inherits": "^2.0.3",
-        "readable-stream": "^2.2.2",
-        "typedarray": "^0.0.6"
-      }
-    },
     "convert-source-map": {
       "version": "1.6.0",
       "resolved": "https://registry.npmjs.org/convert-source-map/-/convert-source-map-1.6.0.tgz",
@@ -1291,21 +1346,6 @@
         "is-symbol": "^1.0.2"
       }
     },
-    "es6-promise": {
-      "version": "4.2.8",
-      "resolved": "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.8.tgz",
-      "integrity": "sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==",
-      "dev": true
-    },
-    "es6-promisify": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/es6-promisify/-/es6-promisify-5.0.0.tgz",
-      "integrity": "sha1-UQnWLz5W6pZ8S2NQWu8IKRyKUgM=",
-      "dev": true,
-      "requires": {
-        "es6-promise": "^4.0.3"
-      }
-    },
     "escape-string-regexp": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
@@ -1512,15 +1552,41 @@
       }
     },
     "extract-zip": {
-      "version": "1.6.7",
-      "resolved": "https://registry.npmjs.org/extract-zip/-/extract-zip-1.6.7.tgz",
-      "integrity": "sha1-qEC0uK9kAyZMjbV/Txp0Mz74H+k=",
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/extract-zip/-/extract-zip-2.0.0.tgz",
+      "integrity": "sha512-i42GQ498yibjdvIhivUsRslx608whtGoFIhF26Z7O4MYncBxp8CwalOs1lnHy21A9sIohWO2+uiE4SRtC9JXDg==",
       "dev": true,
       "requires": {
-        "concat-stream": "1.6.2",
-        "debug": "2.6.9",
-        "mkdirp": "0.5.1",
-        "yauzl": "2.4.1"
+        "@types/yauzl": "^2.9.1",
+        "debug": "^4.1.1",
+        "get-stream": "^5.1.0",
+        "yauzl": "^2.10.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
+        },
+        "get-stream": {
+          "version": "5.1.0",
+          "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-5.1.0.tgz",
+          "integrity": "sha512-EXr1FOzrzTfGeL0gQdeFEvOMm2mzMOglyiOXSTpPC+iAjAKftbr3jpCMWynogwYnM+eSj9sHGc6wjIcDvYiygw==",
+          "dev": true,
+          "requires": {
+            "pump": "^3.0.0"
+          }
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        }
       }
     },
     "extsprintf": {
@@ -1557,9 +1623,9 @@
       }
     },
     "fd-slicer": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/fd-slicer/-/fd-slicer-1.0.1.tgz",
-      "integrity": "sha1-i1vL2ewyfFBBv5qwI/1nUPEXfmU=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/fd-slicer/-/fd-slicer-1.1.0.tgz",
+      "integrity": "sha1-JcfInLH5B3+IkbvmHY85Dq4lbx4=",
       "dev": true,
       "requires": {
         "pend": "~1.2.0"
@@ -1629,6 +1695,12 @@
         "map-cache": "^0.2.2"
       }
     },
+    "fs-constants": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/fs-constants/-/fs-constants-1.0.0.tgz",
+      "integrity": "sha512-y6OAwoSIf7FyjMIv94u+b5rdheZEjzR63GTyZJm5qh4Bi+2YgwLCcI/fPFZkL5PSixOt6ZNKm+w+Hfp/Bciwow==",
+      "dev": true
+    },
     "fs.realpath": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz",
@@ -1648,25 +1720,29 @@
       "dependencies": {
         "abbrev": {
           "version": "1.1.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
           "dev": true,
           "optional": true
         },
         "ansi-regex": {
           "version": "2.1.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
           "dev": true,
           "optional": true
         },
         "aproba": {
           "version": "1.2.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
           "dev": true,
           "optional": true
         },
         "are-we-there-yet": {
           "version": "1.1.5",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1676,13 +1752,15 @@
         },
         "balanced-match": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
           "dev": true,
           "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1692,37 +1770,43 @@
         },
         "chownr": {
           "version": "1.1.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-j38EvO5+LHX84jlo6h4UzmOwi0UgW61WRyPtJz4qaadK5eY3BTS5TY/S1Stc3Uk2lIM6TPevAlULiEJwie860g==",
           "dev": true,
           "optional": true
         },
         "code-point-at": {
           "version": "1.1.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
           "dev": true,
           "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
           "dev": true,
           "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
           "dev": true,
           "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
           "dev": true,
           "optional": true
         },
         "debug": {
           "version": "4.1.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1731,25 +1815,29 @@
         },
         "deep-extend": {
           "version": "0.6.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
           "dev": true,
           "optional": true
         },
         "delegates": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
           "dev": true,
           "optional": true
         },
         "detect-libc": {
           "version": "1.0.3",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-+hN8S9aY7fVc1c0CrFWfkaTEups=",
           "dev": true,
           "optional": true
         },
         "fs-minipass": {
           "version": "1.2.5",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-JhBl0skXjUPCFH7x6x61gQxrKyXsxB5gcgePLZCwfyCGGsTISMoIeObbrvVeP6Xmyaudw4TT43qV2Gz+iyd2oQ==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1758,13 +1846,15 @@
         },
         "fs.realpath": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=",
           "dev": true,
           "optional": true
         },
         "gauge": {
           "version": "2.7.4",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-LANAXHU4w51+s3sxcCLjJfsBi/c=",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1780,7 +1870,8 @@
         },
         "glob": {
           "version": "7.1.3",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-vcfuiIxogLV4DlGBHIUOwI0IbrJ8HWPc4MU7HzviGeNho/UJDfi6B5p3sHeWIQ0KGIU0Jpxi5ZHxemQfLkkAwQ==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1794,13 +1885,15 @@
         },
         "has-unicode": {
           "version": "2.0.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
           "dev": true,
           "optional": true
         },
         "iconv-lite": {
           "version": "0.4.24",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1809,7 +1902,8 @@
         },
         "ignore-walk": {
           "version": "3.0.1",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-DTVlMx3IYPe0/JJcYP7Gxg7ttZZu3IInhuEhbchuqneY9wWe5Ojy2mXLBaQFUQmo0AW2r3qG7m1mg86js+gnlQ==",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1818,7 +1912,8 @@
         },
         "inflight": {
           "version": "1.0.6",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1828,19 +1923,22 @@
         },
         "inherits": {
           "version": "2.0.3",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4=",
           "dev": true,
           "optional": true
         },
         "ini": {
           "version": "1.3.5",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha512-RZY5huIKCMRWDUqZlEi72f/lmXKMvuszcMBduliQ3nnWbx9X/ZBQO7DijMEYS9EhHBb2qacRUMtC7svLwe0lcw==",
           "dev": true,
           "optional": true
         },
         "is-fullwidth-code-point": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": false,
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
           "dev": true,
           "optional": true,
           "requires": {
@@ -1849,13 +1947,15 @@
         },
         "isarray": {
           "version": "1.0.0",
-          "bundled": true,
+          "resolved": false,
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-      "integrity": "sha512-tQtKA9WIAhBF3+VLAseyMqZeBjW0AHJoxOtYqSUZNJxauErmLbVm2FW1y+J/YA9dUrAC39ITejlZWhVIwawkKw==",
+      "version": "3.6.0",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-3.6.0.tgz",
+      "integrity": "sha512-BViHy7LKeTz4oNnkcLJ+lVSL6vpiFeX6/d3oSH8zCW7UxP2onchk+vTGB143xuFjHS3deTgkKoXXymXqymiIdA==",
       "dev": true,
       "requires": {
-        "core-util-is": "~1.0.0",
-        "inherits": "~2.0.3",
-        "isarray": "~1.0.0",
-        "process-nextick-args": "~2.0.0",
-        "safe-buffer": "~5.1.1",
-        "string_decoder": "~1.1.1",
-        "util-deprecate": "~1.0.1"
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
       }
     },
     "realpath-native": {
@@ -4631,12 +4799,20 @@
       }
     },
     "string_decoder": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
-      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
       "dev": true,
       "requires": {
-        "safe-buffer": "~5.1.0"
+        "safe-buffer": "~5.2.0"
+      },
+      "dependencies": {
+        "safe-buffer": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.0.tgz",
+          "integrity": "sha512-fZEwUGbVl7kouZs1jCdMLdt95hdIv0ZeHg6L7qPeciMZhZ+/gdesW4wgTARkrFWEpspjEATAzUGPG8N2jJiwbg==",
+          "dev": true
+        }
       }
     },
     "strip-ansi": {
@@ -4675,6 +4851,31 @@
       "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
       "dev": true
     },
+    "tar-fs": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.0.1.tgz",
+      "integrity": "sha512-6tzWDMeroL87uF/+lin46k+Q+46rAJ0SyPGz7OW7wTgblI273hsBqk2C1j0/xNadNLKDTUL9BukSjB7cwgmlPA==",
+      "dev": true,
+      "requires": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.0.0"
+      }
+    },
+    "tar-stream": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.1.2.tgz",
+      "integrity": "sha512-UaF6FoJ32WqALZGOIAApXx+OdxhekNMChu6axLJR85zMMjXKWFGjbIRe+J6P4UnRGg9rAwWvbTT0oI7hD/Un7Q==",
+      "dev": true,
+      "requires": {
+        "bl": "^4.0.1",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      }
+    },
     "test-exclude": {
       "version": "5.2.3",
       "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-5.2.3.tgz",
@@ -4693,6 +4894,12 @@
       "integrity": "sha1-iQN8vJLFarGJJua6TLsgDhVnKmo=",
       "dev": true
     },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
     "tmp": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.1.0.tgz",
@@ -4799,12 +5006,6 @@
         "prelude-ls": "~1.1.2"
       }
     },
-    "typedarray": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "dev": true
-    },
     "uglify-js": {
       "version": "3.6.4",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.4.tgz",
@@ -4816,6 +5017,16 @@
         "source-map": "~0.6.1"
       }
     },
+    "unbzip2-stream": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/unbzip2-stream/-/unbzip2-stream-1.4.1.tgz",
+      "integrity": "sha512-sgDYfSDPMsA4Hr2/w7vOlrJBlwzmyakk1+hW8ObLvxSp0LA36LcL2XItGvOT3OSblohSdevMuT8FQjLsqyy4sA==",
+      "dev": true,
+      "requires": {
+        "buffer": "^5.2.1",
+        "through": "^2.3.8"
+      }
+    },
     "union-value": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/union-value/-/union-value-1.0.1.tgz",
@@ -5032,13 +5243,10 @@
       }
     },
     "ws": {
-      "version": "6.2.1",
-      "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
-      "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
-      "dev": true,
-      "requires": {
-        "async-limiter": "~1.0.0"
-      }
+      "version": "7.2.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.2.3.tgz",
+      "integrity": "sha512-HTDl9G9hbkNDk98naoR/cHDws7+EyYMOdL1BmjsZXRUjf7d+MficC4B7HLUPlSiho0vg+CWKrGIt/VJBd1xunQ==",
+      "dev": true
     },
     "xml-name-validator": {
       "version": "3.0.0",
@@ -5081,12 +5289,13 @@
       }
     },
     "yauzl": {
-      "version": "2.4.1",
-      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.4.1.tgz",
-      "integrity": "sha1-lSj0QtqxsihOWLQ3m7GU4i4MQAU=",
+      "version": "2.10.0",
+      "resolved": "https://registry.npmjs.org/yauzl/-/yauzl-2.10.0.tgz",
+      "integrity": "sha1-x+sXyT4RLLEIb6bY5R+wZnt5pfk=",
       "dev": true,
       "requires": {
-        "fd-slicer": "~1.0.1"
+        "buffer-crc32": "~0.2.3",
+        "fd-slicer": "~1.1.0"
       }
     }
   }
diff --git a/tests/package.json b/tests/package.json
index d42051a0..aab2b091 100644
--- a/tests/package.json
+++ b/tests/package.json
@@ -17,13 +17,13 @@
   },
   "dependencies": {},
   "devDependencies": {
+    "@babel/runtime": "^7.7.2",
     "@wordpress/jest-puppeteer-axe": "^1.3.0",
     "axe-puppeteer": "1.0.0",
-    "@babel/runtime": "^7.7.2",
     "jest": "^24.9.0",
     "node-forge": "0.8.2",
     "node-static": "^0.7.11",
-    "puppeteer": "^1.19.0",
+    "puppeteer": "^3.0.0",
     "tmp": "^0.1.0"
   }
 }
diff --git a/tests/spec/puppeteer-spec.js b/tests/spec/puppeteer-spec.js
index 8075287e..47ea57ec 100644
--- a/tests/spec/puppeteer-spec.js
+++ b/tests/spec/puppeteer-spec.js
@@ -1,4 +1,5 @@
 const fs = require("fs");
+const os = require('os');
 const path = require("path");
 const puppeteer = require("puppeteer");
 
@@ -14,6 +15,7 @@ describe("Puppeteer basic tests for the Python Editor.", function() {
         // Flags allow Puppeteer to run within a container.
         browser = await puppeteer.launch({
             headless: true,
+            //product: "firefox",
             args: ["--no-sandbox", "--disable-setuid-sandbox", "--disable-dev-shm-usage"]
         });
     });
@@ -160,11 +162,34 @@ describe("Puppeteer basic tests for the Python Editor.", function() {
         const filePath = path.join(downloadFolder, "program_test.py");
         if (!fs.existsSync(downloadFolder)) fs.mkdirSync(downloadFolder);
         if (fs.existsSync(filePath)) fs.unlinkSync(filePath);
-        const page = await browser.newPage();
-        await page._client.send('Page.setDownloadBehavior', {
-            behavior: 'allow',
-            downloadPath: downloadFolder
-        });
+
+        let page = null;
+        if (process.env.PUPPETEER_PRODUCT === "firefox") {
+            // Prepare a settings file to be able to download files to a known location
+            const userDataDir = path.join(os.tmpdir(), "puppeteer_firefox_profiles", "default");
+            if (!fs.existsSync(userDataDir)) fs.mkdirSync(userDataDir, { recursive: true });
+            fs.writeFile(path.join(userDataDir, './prefs.js'), `
+                user_pref("browser.download.useDownloadDir", true);
+                user_pref("browser.download.folderList", 2);
+                user_pref("browser.download.forbid_open_with", true);
+                user_pref("browser.download.dir", "${downloadFolder}");
+                user_pref("browser.download.lastDir", "${downloadFolder}");
+                user_pref("browser.altClickSave", true);`,
+                () => {});
+            // Relaunch browser with correct configuration
+            browser.close();
+            browser = await puppeteer.launch({
+                userDataDir: userDataDir,
+                headless: false,
+            });
+            page = await browser.newPage();
+        } else {
+            page = await browser.newPage();
+            await page._client.send('Page.setDownloadBehavior', {
+                behavior: 'allow',
+                downloadPath: downloadFolder
+            });
+        }
         await page.goto("http://localhost:5000/editor.html");
 
         await page.evaluate(() => document.getElementById("script-name").value = "program test")
@@ -176,6 +201,7 @@ describe("Puppeteer basic tests for the Python Editor.", function() {
         await page.click("#command-files");
         await page.click("#show-files");
         await page.waitFor(100);
+        //await page.keyboard.down("Alt");
         await page.click(".save-button.save");
         await page.waitFor(500);    //waiting to ensure file is saved
         const fileExists = fs.existsSync(filePath);