ignore the double 'smooth'

What security software besides MS Defender are you running? Windows home or pro? Did you try with Firefox in Troubleshoot Mode? https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode#search Desktop, laptop, or DIY? If not DIY, what make and model?

no other antivirus, its windows 11 home, yeah i tried troubleshoot and its laptop with i3 11 gen 8 gb ram

If not DIY, what make and model?

If u are asking about the laptop brand, its hp 15s i3 11gen.

You should run this from HP to check for updates. https://ftp.ext.hp.com/pub/caps-softpaq/cmit/HPIA.html

Or you can just go here to do it manually. https://support.hp.com/us-en/drivers/laptops

If your laptop has Intel, nvidia, or amd graphics you check drivers. https://www.intel.com/content/www/us/en/support/detect.html https://www.nvidia.com/en-us/drivers/ https://www.amd.com/en/support/download/drivers.html

I did all that, but it didnt do anything.It lags only when I use touchpad. Didnt face this issue in chromium based browers

Hi there,

You mentioned disabling hardware acceleration and smooth scrolling, that’s good. Another thing to try:

Go to about:config → search for apz and ensure apz.allow_zooming and apz.force_disable_desktop_apz are default/false.

Reset general.smoothScroll settings if you changed them and if that don't work try checking the multi-finger gestures since it can conflict with Firefox’s scrolling, creating lag. Try disabling three- or four-finger gestures temporarily.

For now, try using a mouse to avoid the issue.