Excessive CPU Use
Firefox is using about 15-20% of my CPU, with only one tab open. Running Firefox 141.0.3 (64-bit). I changed performance settings as suggested in support page; made no apparent difference. Ran Malwarebytes and McAfee scans; nothing detected. I have used Firefox for nearly 20 years, but if I cannot resolve this then I will drop Firefox and switch to another browser.
All Replies (2)
Go to about:processes and find the process which uses more CPU than usual.
A couple of questions: is this tied to the website you have open? I.e. if you go to (for example) https://example.com, does it still use 15-20%? There are many websites that will chew your CPU... How are you measuring CPU use? Windows Task Manager? about:processes may well tell us what's going on. You can also take a profile by going to https://profiler.firefox.com, enable the profiler button, then take a say 10s profile and upload it (upper right corner). Then either put it here or file a bug at https://bugzilla.mozilla.org in Performance.
Thanks!!
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