I have about 25 extensions (almost all needed) and firefox lags like crazy, it’s like I’m watching the videos at 10 fps. I download chrome to test it out and sure enough it runs as smooth as butter. Any help?
EDIT: It somehow fixed itself after I started using LibreWolf (with the same addons)
I’d start by disabling all add-ons and check if that helps. If not, there’s something wrong with Firefox itself.
If disabling them fixed the issue, I’d continue with a binary search to see if there’s a specific addon causing issues. I.e. enable only half the add-ons and re-check. Then continue enabling/disabling add-ons until you know which addon causes the issue.
That said, it could be the combined load, or a combination of add-ons, which is significantly harder to fix.
@Yoru system specs? What add-ons are installed? What video res, 720, 1080, 4k?
recently upgraded to an rx 6600 on a ryzen 5 5600 also 16 gigs of mem. here are the addons: the video res is 1080p
Note that Dark Reader is insanely resource intensive.
(Also note that Disconnect has been unmaintained since before the pandemic and is redundant because UO exists.)
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@Yoru Try clicking the gear in the menu bar, and turning off Ambient Mode. That lagged the crap out of my machine, but on a Intel iGPU.
The dark themes in Enhancer for Youtube also disable ambient mode.
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As they said start disabling every add-on. If this doesn’t solve it, it may be an issue with hardware acceleration. I remember some installations where Firefox wouldn’t decode video on the graphics card by default. Do a duckduckgo ‘hardware acceleration \ Firefox’ and see if it works.
Edit: Also codecs, maybe something with the h265 codecs
What OS and device are you running on?
What extensions do you have running?
This is unlikely to be a simple Firefox problem. Try running Firefox in Safe mode and see if you have problems then (go into the main menu and then help to find the option to run without add-ons).
If the videos play well then it’s your extensions. If the videos do it play well then it’s drivers or the set up of your device.
I’ve only had problems with Firefox playing videos on a Raspberry Pi in the past due to a bug with drivers for video acceleration not working proberly. I had the problem with Pi OS but not a full Linux distro on the same device.
Try frontend alternatives like piped or invidious
unfortunately youtube isn’t the only culprit. Firefox just seems laggy in general, the affect is multiplied in youtube and indivious doesn’t 1080p or 60 fps :/
Does the same happen on a clean profile? (you can create a new one in about:profiles)
On my machine it doesn’t even run properly after fresh installation and new profile and not one single page opened.







