diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index e3e4dd9d7..a3ea42643 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -8,6 +8,7 @@
 - `Fix` - Fix selection of first block in read-only initialization with "autofocus=true"
 - `Fix` - Incorrect caret position after blocks merging in Safari
 - `Fix` - Several toolbox items exported by the one tool have the same shortcut displayed in toolbox
+- `Fix` - Ensure content is wrapped if it exceeds the width of the editor area in Firefox
 - `Improvement` - The current block reference will be updated in read-only mode when blocks are clicked
 - `Fix` - codex-notifier and codex-tooltip moved from devDependencies to dependencies in package.json to solve type errors
 - `Fix` - Handle whitespace input in empty placeholder elements to prevent caret from moving unexpectedly to the end of the placeholder
diff --git a/src/styles/block.css b/src/styles/block.css
index d4288aae6..43087ad83 100644
--- a/src/styles/block.css
+++ b/src/styles/block.css
@@ -16,6 +16,10 @@
     margin-top: 0;
   }
 
+  &__content [contenteditable] {
+    word-break: break-word;
+  }
+
   &--selected &__content {
     background: var(--selectionColor);