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Downloads making Firefox increasingly sluggish during downloading files (lemmy.ml)

submitted 5 hours ago* (last edited 5 hours ago) by hackerwacker@lemmy.ml to c/firefox@lemmy.ml

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I'm running the Ubuntu snap version of Firefox and recently I've had a problem where the more files I download the more sluggish downloads become. When I download a file now, even a few KB, Firefox becomes unresponsive for a few seconds, including video in other windows freezing. For longer downloads, Firefox is unresponsive the entire time. During downloads Firefox uses 1 core 100% in htop and about:performance shows "Firefox" using 100%

Clearing all data in settings doesn't help

Clearing the list of downloaded files doesn't help.

Deleting the profile fixes it, but the problem comes back as I download files.

I have a policies.json file that sets some privacy related settings and installs 3 addons (uBlock0@raymondhill.net, treestyletab@piro.sakura.ne.jp, @testpilot-containers).

I also have a hosts file that blocks all mozilla domains (except addons.mozilla.org)

I have a fast CPU, tons of ram and a nvme drive.

I'm not really sure how to debug this?

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[–] hackerwacker@lemmy.ml 4 points 4 hours ago

Getting the mozilla build fixed the issue, thanks.

How weird. A little unfortunate too since the snap version has apparmor confinement.