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[GH-ISSUE #2178] Floccus addon freezes Firefox #1463

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opened 2026-02-25 22:40:05 +03:00 by kerem · 3 comments

kerem commented

2026-02-25 22:40:05 +03:00

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Originally created by @nolden on GitHub (Feb 19, 2026).
Original GitHub issue: https://github.com/floccusaddon/floccus/issues/2178

Which version of floccus are you using?

5.8.6

How many bookmarks do you have, roughly?

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

Sync method

Nextcloud Bookmarks

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

Firefox 147.0.4 (Fedora Linux)

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

v15.2.1

Which version of Nextcloud? (if relevant)

Nextcloud Hub 10 (31.0.13)

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

No response

Describe the Bug

With Floccus enabled, roughly 60secs after starting Firefox all network connections of Firefox are stalled, open websites stop working. After Quit and Restart, everything works again.

First I suspected proxy configuration change issues (corporate network), but after some debugging I could confirm that disabling the Floccus add-on everything works fine. So it seems the initial sync somehow saturates the network stack (or some other resource) to a point that Firefox doesn't respond anymore.

It seems new behavior since the update to 5.8.6, unfortunately I cannot tell which exact version I had before since I didn't use that system for some time.

When Firefox enters the described state, I cannot download a debug log anymore, the options dialog of Floccus doesn't respond anymore and a warning appears that a website is slowing down Firefox.

Expected Behavior

Firefox works with Floccus enabled.

To Reproduce

In my setup, currently this happens all the time.

Debug log provided

I have provided a debug log file

Originally created by @nolden on GitHub (Feb 19, 2026). Original GitHub issue: https://github.com/floccusaddon/floccus/issues/2178 ### Which version of floccus are you using? 5.8.6 ### How many bookmarks do you have, roughly? 9k ### Are you using other means to sync bookmarks in parallel to floccus? No ### Sync method Nextcloud Bookmarks ### Which browser are you using? In case you are using the phone App, specify the Android or iOS version and device please. Firefox 147.0.4 (Fedora Linux) ### Which version of Nextcloud Bookmarks are you using? (if relevant) v15.2.1 ### Which version of Nextcloud? (if relevant) Nextcloud Hub 10 (31.0.13) ### What kind of WebDAV server are you using? (if relevant) _No response_ ### Describe the Bug With Floccus enabled, roughly 60secs after starting Firefox all network connections of Firefox are stalled, open websites stop working. After Quit and Restart, everything works again. First I suspected proxy configuration change issues (corporate network), but after some debugging I could confirm that disabling the Floccus add-on everything works fine. So it seems the initial sync somehow saturates the network stack (or some other resource) to a point that Firefox doesn't respond anymore. It seems new behavior since the update to 5.8.6, unfortunately I cannot tell which exact version I had before since I didn't use that system for some time. When Firefox enters the described state, I cannot download a debug log anymore, the options dialog of Floccus doesn't respond anymore and a warning appears that a website is slowing down Firefox. ### Expected Behavior Firefox works with Floccus enabled. ### To Reproduce In my setup, currently this happens all the time. ### Debug log provided - [ ] I have provided a debug log file

kerem added the

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2026-02-25 22:40:05 +03:00

kerem commented

2026-02-25 22:40:05 +03:00

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@github-actions[bot] commented on GitHub (Feb 19, 2026):

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! 💙

@github-actions[bot] commented on GitHub (Feb 19, 2026): Hello! :wave: 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! :blue_heart:

kerem commented

2026-02-25 22:40:05 +03:00

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Owner

@marcelklehr commented on GitHub (Feb 20, 2026):

Hey @nolden
Thank you for taking the time to give feedback by raising this issue!
I cannot reproduce this with Firefox 147.0.4 on Fedora and Nextcloud Bookmarks sadly. I don't have 9k bookmarks, though. Could it be a profile thing? I've heard of people solving similar issues by creating a new Firefox profile. Might be worth a shot (You don't have to delete your old profile for this).

@marcelklehr commented on GitHub (Feb 20, 2026): Hey @nolden Thank you for taking the time to give feedback by raising this issue! I cannot reproduce this with Firefox 147.0.4 on Fedora and Nextcloud Bookmarks sadly. I don't have 9k bookmarks, though. Could it be a profile thing? I've heard of people solving similar issues by creating a new Firefox profile. Might be worth a shot (You don't have to delete your old profile for this).

kerem commented

2026-02-25 22:40:05 +03:00

Author

Owner

@nolden commented on GitHub (Feb 23, 2026):

Thanks @marcelklehr for having a look.
Creating a new profile would be the most clean way for sure. For now I created a new folder in Nextcloud Bookmarks, and a fresh sync profile in Floccus, migrating them in chunks. So far this looks good. I can test for a while and then close the issue.

@nolden commented on GitHub (Feb 23, 2026): Thanks @marcelklehr for having a look. Creating a new profile would be the most clean way for sure. For now I created a new folder in Nextcloud Bookmarks, and a fresh sync profile in Floccus, migrating them in chunks. So far this looks good. I can test for a while and then close the issue.

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