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.

The other day I discovered all my extensions have been disabled. I have an old Mac and am not able to upgrade to a newer version of Firefox. Is Mozilla going to offer a solution for people like me who find their preferred browser to now be frustrating and inefficient? I would love to restore my add-ons. Thank you.

I have recently built myself a new computer and started running MS Windows 11.

I have a problem with Mozilla Firefox, where after a few days of being installed it takes 10 seconds or more to load (or to load subsequent new windows). It also takes a long time to switch from window to window or to close any windows. Opening and swapping between tabs is immediate.

Here is what I have tried:

- Switching off hardware acceleration. - Clearing the cache, deleting all other data and uninstalling the single add-on I use. - Creating a new profile. - Using Mozilla's own "Refresh Firefox" option. - Trying the beta version. - Probably some other stuff that I've forgotten about.

The ONLY way I can get things running at the proper speed again is to completely uninstall Firefox using an uninstaller (that also deletes all the registry entries), restart the computer, and then reinstall Firefox.

After setting things back up the way I want, Firefox will run nicely for a number of days, then will slow down again to the point where I have to uninstall and reinstall (whilst also deleting the registry entries).

It doesn't seem to make any difference whatsoever whether the computer has or hasn't been restarted during that time.

Does anyone have any idea why this is happening?

Videos will not play in firefox. They will play in safari. I tried clearing cache and settings to allow websites to auto play video and sound. Nothing is working. It says I have the latest version of firefox. HELP!

Hi -

I've been using Firefox for 10+ years, and have not touched my add-ons etc for years. I also regularly clear my cache of temp files.

That said, searching my (vast) bookmarks in Firefox used to be lickety-split, very fast. Then, it started slowing down, on both PC (Windows 10). Then, a little while later, it started on my laptop (Macbook with latest IoS).

It's now gotten so bad that I am searching my emails to find the links I'm looking for, rather than putting my browser into a coma for a time, because it freezes.

What is the problem, and how do I overcome it?

J

How can I get FireFox to open a webpage on a website on my LAN.

Chrome has same problem.

Safari gets to the webpage fine.

Please see attached image

Hello, i am having an issue with firefox mobile for android not loading certain websites. This seems to happen randomly and i cannot figure out why. When i click on a website url from the search page i sometimes get the error message, "Server Connection Failed", and i cannot get the page to load at all. I have tried to clear my cookies, clear my cache, uninstall and reinstall firefox as well as update it but it still keeps happening. This has been going on for years to the point where i am forced to use other browsers to get certain pages to work and load properly. I dont want to leave firefox because i really need the dark reader extension app because i have photo sensitivity due to epilepsy.

Can anyone help me figure this problem out or offer me an alternative browser where i can turn every page that i search to dark mode like the extension dark reader?

Thank you!

Hello, ever since I upgraded MacOS to 15.3.1 and Firefox to 135.0.1 the top menu bar seems to disappear. I do not know which is the culprit, but on MacRumors (https://www.macrumors.com/) you'll find several others with the same experience.

My personal observation is that it seems to happen on various Silicon hardware (tried 3) and when multiple tabs are active.

The bug is no showstopper, but to proceed you got to click on the (invisible) menu bar in the upper left. Thanks for reading.

JOOP!

Hello! I started encountering this problem as I updated my OS to windows 11. I had eset nod antivirus, but uninstalling it nothing changed. Tried to change MTU cache size through CMD. Changed different DNSes Tried to disable all protection settings in browser and in windows settings. Deleted all extensions. NOTHING helped except clearing cache of the browser, but this is fixing problem only before first browser restart. Other browser on laptop works normally without any issues.

Wasted a lot of my time trying to figure out California DMV registration renewal in firefox. Would not complete transaction. Forced to use chrome instead. So, why should I continue firefox if I'm being forced to use chrome?

I understand Firefox has always had a bit of an issue with SVG - and the 'Firefox has higher standards' doesn't really cut it.

I personally love Firefox but the number of users doesn't warrant spending much time redevloping sites to overcome a shortcoming that no other browser has.

Eg of a website the problem applies to - https://fontmellmagnavillagehall.co.uk/

I can only see 2 emojis on my Facebook items. I used to see 5 or 6 This is a recent problem I can see them all if I use another browser Why is this, and can you fix it? I like Firefox.

Still waiting for an answer to the above question. Why does the page jump back to the top when I want to open a link in a new tab? The link is halfway down a page but when I do a right/left click it jumps and invariably opens the link a few articles above the actual article I want to read. This had been happening for months now and nobody has bother to give a solution.