i noticed that Firefox nightly 145 has reduced WASM performance compare to previous versions…
Webbench - WASM CPU Benchmark → usually i get 115-117 with i7-14500 → now i get ~106
or with Ryzen 5 2500U usually get ~28 → now i get ~24
will test with Ryzen 7 5800X3D on friday
Have you tried Troubleshoot Mode or a new profile? (Don’t remove the old profile, just use a new profile for temporary testing.)
https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
https://support.mozilla.org/en-US/kb/profile-manager-create-remove-switch-firefox-profiles
It would also be useful to use Mozregression to locate the problem change.
The place to report bugs is Bugzilla. Bugzilla Main Page