Firefox Community Forum

Recently upgraded to version 146.0 on Linux (Mint, Cinnamon)

YouTube will work fine when I first start the browser. Eventually videos will stop displaying and sidebar links will not be active.

From a separate forum article I cleared all site data and restarted Firefox. That fixes the problem for about 4 or 5 videos, then you need to rinse/repeat.

The latest incident seems to have been triggered when I tried to watch a video embedded in an X (Twitter) post. That failed. And the YT failed as a whole. X was open in a separate tab container at the time.

While I have both Privacy Badger and uBlock Origin installed, both are deactivated for YouTube.

See the attached images. The video is just not displaying, though the screen is reserving space for the player.

Both/all videos I have tested do work in Chromium.

I sent message below to Bluesky support and have tried all their suggestions (all relating to Firefox), but to no avail.

MacBook Pro OS 10.14.6. Yesterday (9Dec2025) I could open Bluesky & see my profile but could not add a new post. I then did an ‘age verification’ and received confirming emails. When pressing ‘New Post’ button just went to blank page. Under ‘notifications’ at the top, was a message “''''! r.countGraphemes is not a function''''”. I am accessing using ‘Firefox 115.31.0esr (64-bit)’. I have deleted caches, re-started ‘Firefox’ and re-signed into Bluesky, but problem persists.

Could you please advise how I can overcome this problem. Thank you, best regards.

I had so many instances of firefox and tabs that i decided i must organize them on tabgroups, i read they were secure enough and would be restored along with open tabs on new session. But after restarting all my "close and save" tab groups are missing! are they still saved? how can i recover them?

Hi, I have had many successful years using Firefox until 4 days ago. I uninstalled Firefox in order to remedy a recurring missing bookmarks issue.

• I used the 'full' version to re-install - install proceeded to around 50% then crashed my system.
• I uninstalled the remnants and tried to install using the 'stub' installer, it crashed immediately
• I uninstalled all anti-virus software, this time the full installer ran all the way through but when I clicked on Launch Firefox, my system crashed again.
• After each crash, the system restarted and remains stable, nothing else appears to be affected.
• Basic diagnostics, returns no violations
• Each crash returns - stop code: Critical_process_died (0xEF)
• my Win 11 version 24H2 osb 26100.7462, FireFox version 146

any ideas ?

I was positively surprised recently when the new Firefox profile manager (about:profilemanager) was introduced. https://www.tech2geek.net/how-to-use-the-new-updated-profile-manager-in-firefox-2025/ is an article about that.

However, I thought it's just a new visual UI with an in-browser switcher for the existing profiles (that I already had setup). However, it does not appear so.

The differences I see:

1. 1. 1. old profile management

• was managed by `about:profiles` or when starting FIrefox with `-P`
• is saved in `~/firefox` and the `profiles.ini` clearly and quite obviously mentions them there, so it's easy to manage them.

I also found this old support article: https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles

1. 1. 1. new profile management

• automatically asks on startup if more than one profile exists
• is managed by `about:profilemanager` or with the Firefox burger menu
• seems to be saved in `~/.mozilla/firefox/Profile Groups` (Linux path here) in some .sqlite files, and I do not quite understand the format. Not mentioned in `profiles.ini`.
• also, when you change something here (even like opening a profile?), you cannot open `about:profiles` anymore, because it says "Some Firefox process has made changes to your profile, […] you need to restart Firefox", only after a restart further changes would be possible, which I find quite confusing but it also indicates somehow the features belong together?

And this seems to be the new one: https://support.mozilla.org/en-US/kb/profile-management#w_whats-the-difference-between-profiles-and-multi-account-containers

1. 1. Questions

• What are the differences here (I may have missed)?
• How can the new profile feature save so few files? Is it technically called "profile groups"?
• And the most important: How can I migrate an old profile? (In order to use the new features and GUI etc. I quite like)

Some of the installations seem to be blocked by Microsoft if you are using a Microsoft system. If the Software being downloaded is not sold by Microsoft store, Microsoft blocks it or deforms it. During any update, Microsoft removes MusicBee and some other software not purchased from Microsoft store

Using Firefox ESR 115.30 in Windows 7 Ultimate, I routinely open multiple tabs, then, at the end of the day or session I'll bookmark them all into a new folder and close them all.

Later, I might return to that folder and choose to open say, 5 of the group. Is there a way to select all 5 (without opening any) and once I've finished selecting them, have all 5 open at once? Rather than just one at a time? So far it seems that I have to open them one by one.

I have a Mac with Sequoia update but my Mac is not good with memory so when I have a new install version it will probably crash my Mac. How might I stop automatic installation by Firefox?

I have lost all my Firefox bookmarks. All gone. I have searched online for solutions, and have seen what appears to be a standard procedure for doing so. Bookmarks>Manage Bookmarks> LIbrary>Import and Backup>Restore

This is where it breaks down for me......I see no date available to use. All I see is "Choose File" and when I click that, nothing happens. That is the dead end I am at now.

Can anyone out there point me in the right direction? Many thanks. Jay

My computer unexpectedly had to do a factory reset. I had to add Firefox back on to my computer. It was my main default browser. I couldn't remember my password because I had Firefox for so many years. Your system forced me to change my password and now I cannot gain access to my bookmarks/passwords when I sign on. If you tell me that those were lost in the transition, I will be so upset. This was the only reason I was using you and do not understand why syncing is not working or recovering the information. I hope that this can be recovered, if not I have no use for your browser and will switch to a more updated browser in Chrome. I have never had such problems and cannot even remember all the bookmarks I have lost. I will never forget this experience. My hope is it will be because someone there was able to save the day and not because I realized that your company is outdated and clunky like Microsoft. Hoping you can help and completely upset. I am also very confused why my information would not have backed up automatically.

Mike

My Bookmarks Sidebar is now displaying with white lettering on a very light gray background, making it almost impossible to read. How can I change either the font color in the sidebar, or the background color?

When I try to log into Xfinity to pay my bill I get this. Is it related to Firefox? Thought I'd ask you before I tried to work my way to a human at Xfinity

Access Denied You don't have permission to access "http://login.xfinity.com/login" on this server. Reference #18.42d3e17.1765483636.94808bfd https://errors.edgesuite.net/18.42d3e17.1765483636.94808bfd

This happened December 11, 2025