hello j jansen7909,

follow the steps:

step1:

Clear all cookies, site data and cache

• Click the 3 horizontal line top right and select Options.
• Select the Privacy & Security panel and go to the Cookies and Site Data section
• Click the Clear Data button The Clear Data dialog will appear
• Click Clear

step:2

firefox update

Click the 3 horizontal line top right < Help and select About Firefox

The About Mozilla Firefox window opens. Firefox will check for updates and download them automatically When the download is complete click Restart to update Firefox

step:3

Delete temporary file on your system

• win key + R type %temp%
• select the all file hit enter

step:4

Restart firefox and computer

i hope to resolve your problem then reply back to me

Thank you and regards,

Arman

Hey there,

ok, thank you very much for your answer. It helps temporarily, but doesn't resolve the problem: Deleting cache and stuff i've known that for like since i was a child, playing on my 406.

It's not a new issue. It's been like 10 years or something. Firefox slows your system down to a halt. And it sucks. So no more deleting cache answers and such shit if you please. It's just like you got Firefox, you got virus... which does, i don't know what.

Have you updated to Firefox Release 77.0.1 - June 3, 2020

https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster

https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix

https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram

https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding

https://support.mozilla.org/en-US/kb/firefox-takes-long-time-start-up

https://support.mozilla.org/en-US/kb/quick-fixes-if-your-firefox-slows-down

MemTest LAST UPDATED : 27/09/2013
Could you please run a tool from http://memtest.org/
in order to check the integrity of your RAM?

You will need a thumb or disk drive to install it on.

Do you let Windows handle the page file or did you set a fixed size ?
If you use a fixed size for the page file then try the former and let Windows handle the page file.

.... The longer i keep Firefox running, the slower my whole system gets and the slower firefox itself gets - up to a point (generally like about 10 hours or so) where everything becomes so slow, i have to manually shut down Firefox via the Task Manager. All that seems to be independent from the fact whether i actually do something in Firefox or not. ...

Don't you ever restart Firefox when is starts slowing down? And long before you end up using the Task Manager to kill the firefox.exe processes.

I have been assembling my own desktop PC's for 20 years now (before that 16 years upgrading what I was using, with ~ 8 years between new already assembled PC's), and lately my builds (every 6 to 8 years) have included motherboards that were at or near their run of being the "latest" version; usually close to 3 years behind the curve from when I assembled them. From time to time I have had similar problems as you described. Buy a new one OR "make-do" and compensate?

How much memory is Firefox using when this happens ?

How much physical memory do you have installed ?

You can check the Firefox Task Manager (about:performance) and about:memory pages.

• https://support.mozilla.org/en-US/kb/task-manager-tabs-or-extensions-are-slowing-firefox
• https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-or-cpu-resources

"How much memory is Firefox using when this happens ?" Take your pick from between 84 to 98% according to task manager

"How much physical memory do you have installed ?" 8 GB RAM, several GBs free on hard drive

Hey, i am really getting tired of this. Ever since Firefox exists, it has been slowing down systems. Doing i don't know what, collecting data to transmit to Google on what i'd like to buy or stuff like that. I can't be the only one, i've had this problem on 3 PCs in 10 years, always the same shit, and i'm not gonna buy a new PC just for that. So someone plz. tell me what to do - quitting on Firefox is an option.