'''Updated. See bottom for up-to-date question.''' Hello! :) I'm on a pretty fresh install of Debian bullseye. Immediately after launching Firefox ESR, it crashes. Not always, but every ~2nd launch. The Mozilla Crash Reporter "We're Sorry" appears and the crash looks like this in terminal: mars@desktop:~/Desktop$ firefox ExceptionHandler::GenerateDump cloned child 83677 ExceptionHandler::SendContinueSignalToChild sent continue signal to child ExceptionHandler::WaitForContinueSignal waiting for continue signal... mars@desktop:~/Desktop$ I tried making a fresh profile without addons/settings, and it still crashes but less at every ~6-7th launch. However, it does not crash in safe mode, though visiting websites while in safe mode is laggy. Here is the terminal of safe-mode: Missing chrome or resource URL: resource://gre/modules/UpdateListener.jsm Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs Missing chrome or resource URL: resource://gre/modules/UpdateListener.jsm Missing chrome or resource URL: resource://gre/modules/UpdateListener.sys.mjs Sandbox: Unexpected EOF, op 0 flags 00 path /proc/cpuinfo Any idea? Thanks in advance! Extra observations: * Didn't have these issues with Firefox on Fedora (Wayland) and Gentoo. * Toggling Caps Lock takes about half a second to activate/deactivate in Firefox, resulting in a lot of accidentally capitalized letters. * Generally, Firefox seems pretty slow and scrolling through items/websites with images is a bit choppy. Websites load slower compared to my forementioned distros. * Not sure if it matters, but I installed Debian with automatic/guided (encrypted LVM) and noticed after that my swap size is only 980 MB when my RAM is 16 GB. Just mentioning it in case it's relevant. System info: * DE: XFCE with x11. * Kernel: 5.10.0-21-amd64. * GPU: NVIDIA contrib non-free driver. Force Composition Pipeline ON. Allow Flipping OFF. TripleBuffer ON. * CPU: Intel i5 6600K ------------------------------------------------------------------------------------------------------------- '''UPDATE:''' I found the cause of the crash. If I enable Use hardware acceleration when available, Firefox crashes on launch. If I disable it, it doesn't crash which is nice. BUT, it leads to unbearable lag and puts my CPU usage to 70-100% when dealing with videos or images. This exact thing happens on two fresh installs on different SSDs. Any advice? Do I need some additional drivers for my Debian install? Thanks! Info: * Debian Bullseye. * Firefox ESR 102.10.0. * GTX 970 w/ proprietary nvidia-driver. * GNOME on X11.