Firefox Developer Edition Fails to Sync via GitLab Repo

[aaadinolfi]

Which version of floccus are you using?

5.8.3

How many bookmarks do you have, roughly?

~50

Are you using other means to sync bookmarks in parallel to floccus?

No

Sync method

Git

Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please.

Firefox Developer Edition 147.0b9 on Windows 11

Which version of Nextcloud Bookmarks are you using? (if relevant)

No response

Which version of Nextcloud? (if relevant)

No response

What kind of WebDAV server are you using? (if relevant)

No response

Describe the Bug

Syncing via GitLab in Edge on Windows 11 working as expected. Syncing fails via Firefox Dev Edition on the same system (where it previously worked). I've reinstalled Firefox, removed and reinstalled the Floccus plugin, rebooted, and attempted to force a sync (no change).

When syncing Firefox via GitLab repo, the following error message is received repeatedly (any time a sync is started):

2026-01-11T03:45:29.610Z Starting sync process for GitLab Profile
2026-01-11T03:45:29.618Z onSyncStart: begin
2026-01-11T03:45:29.618Z (git) init
2026-01-11T03:45:29.620Z Syncing failed with (intermediate value).includes is not a function
2026-01-11T03:45:29.620Z onSyncFail

I've exported the profile from Edge, and created a fresh profile, no change.

Expected Behavior

Sync should be successful in Firefox Developer Edition via GitLab repo (as it was previously and is still functional in Edge).

To Reproduce

Install latest build of Firefox Developer Edition, install Floccus plugin. Configure new profile to sync with a GitLab repo via a security token and API level permissions (again, the same configuration as in Edge). Sync will fail and provide the error messages noted above.

Key log entry: Syncing failed with (intermediate value).includes is not a function

No additional log information is provided by the plugin.

Debug log provided

• I have provided a debug log file

[github-actions]

Hello! 👋

Thank you for taking the time to open this issue with floccus. I know it's frustrating when software causes problems. You have made the right choice to come here and open an issue to make sure your problem gets looked at and if possible solved. Let me give you a short introduction on what to expect from this issue tracker to avoid misunderstandings. I'm Marcel. I created floccus a few years ago, and have been maintaining it since. I currently work for Nextcloud which leaves me with less time for side projects like this one than I used to have. I still try to answer all issues and if possible fix all bugs here, but it sometimes takes a while until I get to it. Until then, please be patient. It helps when you stick around to answer follow up questions I may have, as very few bugs can be fixed directly from the first bug report, without any interaction. If information is missing in your bug report and the issue cannot be solved without it, I will have to close the issue after a while. Note also that GitHub in general is a place where people meet to make software better together. Nobody here is under any obligation to help you, solve your problems or deliver on any expectations or demands you may have, but if enough people come together we can collaborate to make this software better. For everyone. Thus, if you can, you could also have a look at other issues to see whether you can help other people with your knowledge and experience. If you have coding experience it would also be awesome if you could step up to dive into the code and try to fix the odd bug yourself. Everyone will be thankful for extra helping hands! If you cannot lend a helping hand, to continue the development and maintenance of this project in a sustainable way, I ask that you donate to the project when opening an issue (or at least once your issue is solved), if you're not a donor already. You can find donation options at https://floccus.org/donate/. Thank you!

One last word: If you feel, at any point, like you need to vent, this is not the place for it; you can go to the Nextcloud forum, to twitter or somewhere else. But this is a technical issue tracker, so please make sure to focus on the tech and keep your opinions to yourself.

Thank you for reading through this primer. I look forward to working with you on this issue! Cheers! 💙

[marcelklehr]

Hey @aaadinolfi
thank you for taking the time to give feedback by opening this issue!
Do you have firefox configured to run in private mode?

[aaadinolfi]

Sure enough, I needed to switch Privacy and Security > History from "Never Remember History" (which I've always used in the past) to "Use Custom Settings for History" and then manually disable "Always use Private Browsing Mode". 😑

Thanks for the wicked fast response!