Firefox Community Forum

Occasionally, and typically only after a reboot, Firefox starts consuming a significant amount of CPU time. This typically goes on for several minutes, and if I close and reopen Firefox, the process begins again. It's enough CPU that the fans kick on high through most of the process, and considering I'm only opening the browser (not even switching tabs to actively load any other pages), I don't know why it would do this. Similarly, if it were related to typical startup behavior, why doesn't it do this every time?

While I generally trust that this is intentional and is unlikely the result of malware, I'd still like to know why Firefox does this at all and what it's doing. I'm not sure if I can collect any logs or get any other info about this. From process monitors, it appears to be the main executable that's consuming the additional CPU and not any of the isolated instances.

I collected the troubleshooting information, and saved it, but I am hesitant to share without knowing what type of information is contained (and I can see some sensitive stuff like file paths)

OS: Ubuntu 24.04 LTS (Linux 6.8.0-36-generic) Firefox Version: 127.0.2 (deb) Build ID: 20240624183754

When I use the puzzle icon to access my extensions, my view is completely different from the images provided in various posts. i do recall the screen shots that were posted as similar to earlier extension management methods used on my previous Firefox. There is no gear to the right of my extensions; i show an enable/disable switch and a 3 dot menu "..." remove/report/manage. I have attempted to reinstall both extensions without success. I have never had problems installing any of my previous extensions, so this has been interesting. firefox esr ?.. Current version is installed.

Why do i have a different extensions page than described, and is there a way to pin my extensions differently?

Hello, I am using firefox on a desktop with linux manjaro. Everytime I minimize the browser it's closed instead. I have gone through the setting of my operating system, and firefox. I cannot find any reason why the browser would close instead of minimize.

Thank you, Gary

Hi,

When I seek in videos, for example on youtube, it almost always hangs the entire machine. The same issue happens randomly as videos run, eg after about 5-7 minutes.

I'm struggling to get more information on what is happening (eg logs) because the whole system hangs.

Here are some things I have discovered:

1. I can reproduce in a fresh profile 2. I can reproduce with the flatpak version 3. I can't reproduce in the Brave browser 4. I can't reproduce the problem on Windows, only on this Linux machine

I'm running on Linux (debian bookworm). I'm using wayland. I have an intel i915 GPU (Alder Lake).

The problem started recently (last few days), but I'm not able to nail down exactly what changed.

What I really want is any way to get more information about what is happening - logs or debug output or whatever. Then I can work out if the bug is in Firefox, or something else on my system (eg intel graphics drivers)

Thanks, Cal

i used to be able to go full screen mode in firefox, for example in youtube, by clicking the full screen mode button in lower right corner. this does not work any more and not only in youtube. any stream with full screen does not work. this is Firefox only as fully screen works in Opera. clicking the title bar and choosing full screen does not help. I am on Linux mint.

I recently switched to Linux mint (cinnamon) from windows 11 and have set firefox back up but the tab bar now squishes the tabs, like chrome ,instead of scrolling, like it had on windows 11. Is this feature not available on linux? And if it is how do you set it up, because I cannot find anything about it in the settings. Many thanks!

Hello,

I deployed central management of firefox yesterday and I am suffering firefox hangs on startup (prior to opening any window) after configuration change from pref to localPref. When I kill firefox and run again it usually start normally. Usually one kill is sufficient, but I observed also two subsequent kills are necessary.

I created these files:

/usr/lib64/firefox/defaults/pref/autoconfig.js:

pref("general.config.filename", "firefox.cfg"); pref("general.config.obscure_value", 0);

/usr/lib64/firefox/firefox.cfg:

// This comment is mandatory lockPref("autoadmin.global_config_url","http://www/firefox/firefox.cfg"); lockPref("autoadmin.append_emailaddr",false);

and in the firefox.cfg on a website I have for example: lockPref("network.proxy.type", 4);

when I change the lockPref to pref in this file, everything works normally, but when I change it back to lockPref I get a firefox hang on startup. What am I doing wrong?

Thanks

Marek

I've been using Firefox for a while and there is one file storage site that is always an issue for me. Downloads work but frequently, it stops near the end of the transfer and shows "failed" in the Library window.

Every time, I can click "resume" and it works but it's extremely annoying. If I don't watch the download carefully, I might miss the "failed" message and then the download link times out. There should be a setting to automatically retry a certain number of times.

I've tried multiple add-ons and none of them work.

Hello every professional engineer

I knew how to convert the Firefox file sessionstore.jsonlz4 to .json file by using this website https://www.jeffersonscher.com/ffu/scrounger.html

and after editing the resulting .json file

How can I convert it back to .jsonlz4 file to return it to my Firefox profile as it was?

For a long time I've used Firefox on Linux with multiple instances each with their own profile folder. Today when I try to run these instances with separate profile folders I get the following error:

> Firefox is already running, but is not responding. To use Firefox, you must first close the existing Firefox process, restart your device, or use a different profile.

Profiles are created like this:

firefox --new-instance --createprofile "PROFILENAME ~/.firefox-PROFILENAME"

They are run like this:

firefox --new-instance --profile "~/.firefox-PROFILENAME"

It seems something has broken with the instance isolation as this is now throwing an error. Additionally I run "createprofile" it doesn't seem to actually create the folder.

Just for info this site works fine on other browsers on same machine, and on other machines. It is a Firefox issue.

Running version 127.0.1 on Linux.

Message is

Secure Connection Failed

An error occurred during a connection to vehicleenquiry.service.gov.uk. PR_CONNECT_RESET_ERROR

Error code: PR_CONNECT_RESET_ERROR

   The page you are trying to view cannot be shown because the authenticity of the received data could not be verified.
   Please contact the website owners to inform them of this problem.

In recent Firefox versions, long container names are trimmed to around fifteen letters. Is there a way to disable this feature?

Since containers are named by the same user as the browser, people who want shorter names will name shorter ones by themselves. I wonder who wants this feature.

Version: 127.0.2

I have four browsers on my Linux box: Chrome, Chromium, Thorium, and Firefox.

Firefox is painfully slow using Google Earth, all the others are fast with Google Earth.

This is fairly recent behavior (last month or so).

As far as I can tell, FF is configured to allow Web Assembly (WASM) to be used for rendering images, etc. Since Google Earth is written in WASM, I don't have a clue why it is so horribly slow.

scrolling/sliding the image around on the screen is slow and jumpy. Displaying images attached to a waypoint is extremely slow: It takes 5-10 seconds to switch from one image to the next.

Any suggestions? Thanks in advance!

Fred

I am using Linux Mint with Firefox 127.0.2 (64-Bit)

In Preferences Applications, setting

 CSV-Dokument      to    open with firefox

opens edless new firefox Tabs - so I had to kill firefox. (setting CSV-Dokument to open with OpenOffice works fine. But this is not what I want.)

In Preferences Applications, I found further CSV types: application/csv-Typ CSV Document (application/text) CSV Document (octet/stream) CSV Document (application/x-download) Which applications should I use for them ?

I found the file "mimeTypes.rdf". However, I am not familiar with the syntax.