Hallo,
* Daniel Harris [Mon, Jan 13 2025, 02:26:06PM]:
>    Hello
>    I am a very long time happy firefox user using debian stable, but what on
>    earth is going on with firefox lately.  It is terrible.  So slow and why

For the start, please open a tab with "about:processes" (or
"about:performance", depending on the version) and check the activities
there.

>    is it not possible to have 2 separate instances anymore.
>    I have to say that reluctantly I have started using chromium, and i must
>    say it is so much faster and its also possible to have seperate instances
>    without the cookies and stuff being used in both of them.

I have been in a similar situation about a year ago (and had to use
chromium for a couple of months) and it suddenly resolved itself after
some unknown update.

Please run your firefox process wrapped by strace to observe what is
going on underneath. It might not be super helpful but at least in case
of some rogue extension or feature you might get some idea. I.e. run:

strace -f -o logfile.txt firefox

And then examine logfile.txt for strange patterns, like endless repeated
file opening or similar.

You might combine this with enabling debug logging of firefox, I think
this should work like with:

export MOZ_LOG="all:5"

(but you might want to read more about MOZ_LOG online since I am not an
expert, the way it behaved looked like black magic to me)

Good luck,
Eduard.

--
Every great idea is worthless without someone to do the work. --Neil Williams

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