Firefox Community Forum

For some weeks I have ad an issue with Firefox using 50%-100% of CPU. Normally it is the Firefox process itself, sometimes it is also "Privileged Cont".

OS is Kubuntu 24.04. Firefox has done this across 2-3 versions.

Things I have tried:

Restarting Firefox No change, I'll even get 100% cpu usage with no tabs open

Refresh Firefox to remove settings and addons No change

Uninstall Snap and try direct Apt package No change

Remove ~/.mozilla to fully remove any residual settings/cache/etc No change

Try with and without hardware acceleration See: https://support.mozilla.org/en-US/questions/1308215 No change!

I would blame my old computer hardware, but Brave runs fine. I am now using Brave, but would dearly like to return to Firefox as I miss containers, and I don't support a chromium dominated web.

Firefox 136.0.1, Linux 6.8.0-55, have set Okular as default pdf application, however Firefox will not open pdf file when downloaded nor will it open the file when selecting Open File from the Download Icon on the toolbar. Only was I can get to file is to select Show in Folder option and open from within Dolphin.

apparently, programmers don't understand how aggravating not having backward compatibility is to the rest of us, so please bear with my extreme aggravation here. IF IT AIN'T BROKE, QUIT FIXING IT.

 firefox disabled my addons, thus forcing me to upgrade, and now I am angry. Tried downloading the new version several times. My os is as updated as it can get. Using the APT link from this site, it just shows garbage. Using the download for linux 64 bit link, it makes me jump through hoops and looks like it is working, but it looks different and none of my bookmarks transferred over. Closing it down and reopening it, I see the old version, thus making it look like I am possibly running both versions separately. Once the *all new singing and dancing special that is supposedly so much better than the old that some ignoramus decided I MUST use it instead of the old and functional one* is closed out, I see no way to reopen it. And neither version will enable or allow me to download singlefile. That is the only program I need from firefox at this time.
 Will somebody please show me, step by step, as if I am 5 years old, a back door that will enable my addons, before I go nuts and start beating programmers to death with reams of algorithms?

very frustrated, and pissed at how programmers always screw things up that are working just fine by upgrading crap. Now, I have suddenly had all of my addons quit working, was forced to update my firefox. Nothing changed, and it still shows that I am using version 105, instead of the all-new, better and fancier, singing and dancing crap that is being forced upon me.

Here are the dpkg/apt logs for update:

2025-03-19 12:33:16 configure firefox:amd64 136.0.2~build1 <none> 2025-03-19 12:33:16 status unpacked firefox:amd64 136.0.2~build1 2025-03-19 12:33:16 status half-configured firefox:amd64 136.0.2~build1 2025-03-19 12:33:16 status installed firefox:amd64 136.0.2~build1

The problem is that when I tried opening gmail in my ubuntu, it is stuck at loading page, but other browsers like edge can open it without any problem (on the same system).

I tried every thing I can in the support forum of gmail/mozilla/others, but it's still stuck at loading.

That's all.

I use Firefox with DuckDuckGo on Ubuntu 24.04, Gnome desktop. My Firefox browser window regularly freezes but can be unfrozen by simply repositioning the window. This is really annoying.

I also use Chromium on the same system and there are no issues.

Any ideas?

Hello, - Computer Nec Versa One P/N NNAN1700202 (32-bit) - XUbuntu 18.04.2LTS (i386), no upgrade possible to 19 LTS

- Message asking for an update of Firefox (expired root certificate, extensions disconnection) - Proposed download completed (Firefox 135.0)

- Firefox/ Help/ "About Firefox": 113.0.2 (32 bits), no update proposal - Launch the . exe file from previous download In the "About Firefox" window, version 135.0 appears well during installation When the computer is restarted, this panel has returned to version 113

The computer works normally and perfectly meets my needs (emails and internet searches), so it is out of the question to change it (it would be scandalous from an environmental point of view)

What should I do? Thank you for giving me the precise instructions on how to proceed. Sincerely, FC

Thought only Ubuntu's linux firefox 136.0 was 'unstable' on my Gateway E-475M laptop - crashes, restores session then freezes only to log me out, then completely locking up requiring holding down power button and rebooting...

NOW, even firefox 136.0 on WIN7 is crashing, then restores session only to go to the 'blue screen of death' requiring holding down the power button and rebooting...

EVIDENTLY, the problem is NOT with Ubuntu or WIN7, but either: firefox (linux or win version); or, the Gateway E-475M laptop (2.0GHz CPU, 4Gb RAM, 8Gb swapfile, Harddrive at 61% usage, linux/win on separate booting partitions, LAN + usb & pci wifi's, etc.) - both OS's USED to work fine, but as upgrades to firefox have come along, they have steadily gotten more and more unstable...

Sometime, I'm only making a bookmark, and it starts this circus act... does it on differing websites, etc. Firefox is the only thing loaded - using two windows on two different monitors.

...at a loss as to what to do - firefox is supposed to be THE lightest-weight browser out there, and was for awhile...

- - - - - the only extension used on both systems is NoScript - could THAT be causing the disturbance in the force?!?

Hi,

I have a question to the Firefox Snap permissions. I want to give Firefox the minimum of permissions which you can grant via Settings => Apps => Firefox Web Browser, because of security reasons.

So, a lot of them are self-explanatory, but there are some where I can’t imagine what that means and whether Firefox really needs such permission to run correctly and save or not. These are the following:

- Run in Background - Detect network devices using mDNS/DNS-SD - system-files - gsettings - Access hardware information - Mount-control - login-session-observe - opengl - system-packages-doc - Read/write access to U2F devices exposed - Access energy usage data

So, my question is: Does Firefox really need one of these above permissions to run correctly and save (I am asking because I don’t know if some of the above permissions are for security reasons activated) or can I turn them off?

Thank you!

Have an old computer and running Ubuntu

Want to keep Firefox but old man and don’t understand certain aspects

Could somebody email me a link that help? Is there such an animal?

Email to

That is the first line in the Hippocratic Oath. All doctors have to swear to it. All software developers should too.

I made the mistake of letting Firefox on KUbuntu update. It obliterated all my tabs and all my history. There's nothing left. I had a lot of tabs open with intent to use them to update some astronomy instructional activities. I don't know if I'll be able to find them again.

I don't really have a question except to ask: What fresh hell is this? Is it really that hard to just leave things the hell alone? I'm afraid to ever update Firefox again. If everything else wasn't based on Chromium, I'd be out of here.

Also, it looks like something out of Windows 7.

It's all gone. It's a wonder you didn't delete all my bookmarks while you were at it.

Firefox 135.0 (64-bit) on Ubuntu 22.04.5. When trying to save any file (download, save image etc.) or trying to attach a file (in web-based gmail client or WhatsApp web client) nothing happens. Tried to refresh, switch off all extensions, clear download history - nothing helped. Chrome works on the same machine like a charm...

Do you have any suggestions?

Thank you

Err:15 https://example.com/apt stable Release

 404  Not Found [IP: 2600:1406:3a00:21::173e:2e65 443]

Hit:16 http://mirrors.cqu.edu.cn/ubuntu noble-security InRelease Reading package lists... Done W: http://http.kali.org/kali/dists/kali-rolling/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details. E: The repository 'https://example.com/apt stable Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.