Firefox slow and clunky... should I switch browsers?

[This reply should have been to bennylava. Newbie error.]

My experience with Firefox 74.0 is that it's better than ever.

I experience one small annoyance with YouTube: if I switch between windowed-mode and fullscreen while a video is playing, things can get funky like you described, with audio/video out of sync, etc. But as long as I remember to pause the video before switching display mode, it works great.


Yes. No. Maybe.

Blue. No, yel--


Try without your extensions .. as it seems you may be prone to using bad ones like ABP.
Or maybe its an underlying issue with your system configuration.
We wouldnt know without real system info ( How to provide good information in your posts )
And its pretty trivial for you to try out another browser - install falkon or chromium or... Then test it.


From what I read :

  • check your ISP box (is it updated ? restart it - apply the updating procedure)
  • show us your addon list :
grep -oP '},"name":"\K[^"]+' ~/.mozilla/firefox/*.*/addons.json
  • I confirm you have to get rid of Adblock plus & replace it with Ublock Origin
  • For the dark theme sites, give us examples - usually's if you see light then dark theme, it is bad css on the site or a ■■■■■■ dark theme extension on your browser.

You also may have memory management issues, give us :

cat /proc/sys/vm/swappiness
cat /proc/sys/vm/vfs_cache_pressure
swapon -s
free -h --si

Firefox can sometimes consume more CPU and RAM resources than Chromium on certain sites depending on how they are coded. I have seen this on my machines and I don't run any extensions in either so it's simple to compare the two. I enter competitions on a site called iWon. If you open enough tabs from this at the same time by clicking through to open tabs for all the competitions at once, you can max out a machine with 8GB of RAM in Firefox and of course it takes longer to do so. In chromium the total RAM consumed is around 6GB instead. That's a clear indication to me of the difference in ability to handle scripts between the two browser engines.

Whether you should switch is still your call though. There are multiple threads covering the pros and cons of each browser available on this forum already. Most boil down to privacy concerns though.

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Yeah I'm not sure why it does that either. If there's a site with a dark theme, typically firefox will show the original bright white theme first, then switch on the dark theme like it's supposed to. This can be somewhat... off putting at night. Any site that I frequent that has a dark theme, I'm using it. It doesn't always happen, but most of the time it does.

Here's the output from those commands that nam1962 recommended that I post up:

Matte Black (Red)
Dark Theme for Google™
Dark Theme for YouTube™
uBlock Origin

                  total        used        free    shared    buff/cache   available
Mem:               7.9G        3.0G        766M    687M      4.2G         4.0G
Swap:                0B          0B          0B

unfortunately it doesn't really line up but I think you can still tell where everything is supposed to go. 7.9G total memory. 3.0G free. 766M shared, 4.0G available. That's with 6 firefox tabs open and 2 of them are youtube videos, although they're not playing. I don't have the swap file turned on, i prefer not to use it if I don't need one.

U know the rule : ■■■■ in, ■■■■ out.
So... get rid of :

  • Pushbullet (I don't get the benefit, if U really want to use WhatsApp, use it through Hamsket... )
    Matte Black (Red)
    Dark Theme for Google™
    Dark Theme for YouTube™

I have no clues about MetaMask

Can U give us all asked commands returns?

We don't care about feelings about swap, but about facts.

1 Like

Note - I edited your output.
In the future you can enclose with 3 ticks (```) or you can use the </> code button.
Also - you have it twisted .. most of your RAM is being used by the cache/buffer.

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During last week, I've tried Firefox 76 nightly and Wayland. On sway, Gnome/Wayland and Plasma/Wayland.

76 Nightly now support h264 and vp9 hardware decoding on Wayland.

Result is quite amazing. Playing 4k@60Hz on YouTube flawlessly without maximum fan speed. Almost on par with mpv in case cpu consumption. UI responsiveness is much better. Smooth scroll is almost perfect.


But wayland is still not for prime time.

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Thank you for the reply. I don't think that I want to put the Cache on the RAM because it would wipe out all the site date each time. Sounds like a cool idea, but there's certain things I want to be saved. It is nice not to have to use a swap file though, although I'm wondering if I might actually need to upgrade to 16Gb of RAM for that these days.

Anyway I think that some of my addons may have been the trouble. As per one member's recommendation, I switched away from Adblock Plus and that seems to have sped things up some. I also got rid of the youtube dark theme addon when I remembered that youtube has one natively in the site.

As for sites that flash a bright white screen before loading the site in dark theme mode.. this site is one of them. Here's another site. Also note how long it takes to load this site:

Granted that isn't actually all that long, it's just longer than I'm used to waiting on that site. I use windows as a comparison (i know, for some strange reason that just makes linux fanboys scream while clawing their eyes out) and it does not flash the white screen first on either site, and it loads slower sites slightly faster. Who knows why. But again, it does seem to have at least sped up a bit since getting rid of those two addons.

We still need :

grep -oP '},"name":"\K[^"]+' ~/.mozilla/firefox/*.*/addons.json
cat /proc/sys/vm/swappiness
cat /proc/sys/vm/vfs_cache_pressure
swapon -s
free -h --si

Expressing opinions or feelings is nice, but wont help, data will help.

This overclock site is not designed for performance :stuck_out_tongue:

Well yes but again, I already fixed the issue by way of recommendations here. It must have been one of those addons that was causing the problem. Firefox does seem faster now.

Cool. Why not tagging it as solved then.

1 Like

Well, you felt it was slow, you now feel it seems faster and it must (may, perhaps..) be due to...

I'm always puzzled when an OP refuses to give command feedback.


No it's faster. It's not based on a "feeling", it's faster. I'm also puzzled as to your concern about feelings in this thread. There was never any feeling posted. A preference maybe, that has merit in some cases, but nobody ever went into anything to do with feeling this way or that.

As for not posting it up, I will if it will benefit someone else in some way. However as far as I'm concerned the problem is solved, so notable was the effect. As has been the case with many of my other issues posted here. Problem solved.

Well... Obviously, politeness and courtesy have not been part of your education.
So, I'll list some "benefits" as you say...

  1. respect of the future readers of the thread who would be pleased to understand if the environment is the same as theirs.
  2. basic consideration of the time of the persons who cared about your problem and asked for info to solve it.
  3. not been a vampire as @antikythera noticed you seem to be...

"Well... Obviously, politeness and courtesy have not been part of your education."

Did you consider your education in politeness and courtesy when you first started throwing accusations of "feelings"? You were responding to me saying "prefer". Totally unnecessary. So if you're going to bring up politeness and courtesy, I'd revisit that post first and make sure you didn't initiate the whole thing. You'll probably get all the "politeness and courtesy" you want if you'll sit on your own feelings and take care not to toss around accusations so easily.

Maybe it was a misunderstanding, and if so this is all a complete waste of time, but I doubt it as you just kept on with the "feelings" stuff. Even after I attempted to explain that there were little if any feelings being expressed here. Remember, intent can be somewhat unclear when communicating via text. That's why jokes so often give offense.

If the situation here has been resolved, then let's just leave it at that. No further posting by any party is necessary and the rest is just useless argument on politeness and accusation throwing. :lock:

Seems like the original problem is solved.

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