Hi wither 3:
Try following each of the steps listed in the support article Troubleshoot and Diagnose Firefox Problems
I would actually start with the final step in that support article and scan for malware
, just in case your browser has been infected with a cryptojacker that is using your computing resources to mine Bitcoin or some other cryptocurrency. If you antivirus doesn't detect anything run a second-opinion on demand scan with Malwarebytes Free v3.5.1
(the legacy version for Win XP and Vista, download from the FAQ article <here
> or from https://downloads.malwarebytes.com/file/mb3_legacy
) to look for any malware or PUPs that might have been missed by your antivirus.
A clean reinstall of Firefox
as instructed in STEP # 4 should solve the problem if your Firefox installation is corrupted. Use a fresh copy of the ESR v52.9.0 installer from Directory Listing: /pub/firefox/releases/52.9.0esr/win32/
(choose the subfolder for your region and language e.g., the /en-US subfolder for the English-US installer Firefox Setup 52.9.0esr.exe) . A clean reinstall of the Firefox software will not remove your Firefox user profile that is stored a hidden folder at C:\Users\<username
> so none of your browser extensions, bookmarks, etc. should be affected.
Step # 5 is a browser refresh
, which will create a new user profile and remove your browser extensions without deleting other items like your bookmarks, passwords, browsing history, cookies, etc. As a precaution, I always back up my bookmarks at Bookmarks | Show All Bookmarks | Import and Backup | Backup before refreshing my browser. However, you said that starting Firefox browser in Safe Mode
in STEP # 3 (now called Troubleshoot Mode
in newer Firefox versions) with your browser extensions and graphics hardware acceleration disabled didn't solve your high RAM usage so it's less likely, but not impossible, that a browser refresh would solve your problem.
Note that if you reach STEP # 4 and a clean reinstall of Firefox doesn't help, I would suggest you skip over the browser refresh in STEP # 5 and go straight to STEP # 6 to create a fresh Firefox user profile
(i.e., by closing Firefox and starting the Profile Manager
manually as instructed in the support article Profile Manager - Create, Remove or Switch Firefox Profiles
). If you test with a fresh profile (i.e., no extensions, bookmarks, cookies, etc.) and your problem disappears then you can try the browser refresh in STEP # 5 after re-starting Firefox with your old (default) profile. Even better, skip the browser refresh and just export your bookmarks from your old profile, import your bookmarks into your new profile, and then use the Profile Manager to set your new profile as the default. If that solves the problem then start reinstalling your browser extensions one-by-one and test to see if one of your extensions is consuming increasing amounts of RAM over time.