Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

VERY HIGH CPU USE with pages that never finish loading

Mike Landis
Mike Landis
more options

Firefox was using GOBS of CPU, so I killed the master process and relaunched, but after launch I couldn't get any pages to finish loading. I then hoped to copy URLs from tabs and paste them into Floorp (which is working fine, as is Chrome), but I couldn't even snag the URLs (dominated by YouTube pages). I ran a full-system virus scan, finding nothing. The most recent Windows-11 update on 2026-Jan-15 isn't recent enough to be a likely causal factor. Firefox has about twice as many extensions as Floorp, but it was running fine until late yesterday (it's now after 3AM). I couldn't get the extensions page to load, so I've attached a screenshot of C:\Users\Mike2\AppData\Roaming\Mozilla\Firefox\Profiles\oa7ou5xk.default-release-1715337056307\extensions There are several other profiles, but there's very little in them (one profile with a times.json & several profiles containing a parent.lock file)

Processor Intel Core i9-9980HK CPU @ 2.40GHz (2.40 GHz) Installed RAM 128 GB System type 64-bit operating system, x64-based processor MSI GT75 Titan 9SG

If I reinstall, will I lose all of my tabs?

Firefox was using GOBS of CPU, so I killed the master process and relaunched, but after launch I couldn't get any pages to finish loading. I then hoped to copy URLs from tabs and paste them into Floorp (which is working fine, as is Chrome), but I couldn't even snag the URLs (dominated by YouTube pages). I ran a full-system virus scan, finding nothing. The most recent Windows-11 update on 2026-Jan-15 isn't recent enough to be a likely causal factor. Firefox has about twice as many extensions as Floorp, but it was running fine until late yesterday (it's now after 3AM). I couldn't get the extensions page to load, so I've attached a screenshot of C:\Users\Mike2\AppData\Roaming\Mozilla\Firefox\Profiles\oa7ou5xk.default-release-1715337056307\extensions There are several other profiles, but there's very little in them (one profile with a times.json & several profiles containing a parent.lock file) Processor Intel Core i9-9980HK CPU @ 2.40GHz (2.40 GHz) Installed RAM 128 GB System type 64-bit operating system, x64-based processor MSI GT75 Titan 9SG If I reinstall, will I lose all of my tabs?
Attached screenshots

All Replies (1)

Mike Landis
Mike Landis Question owner
more options

I tried reinstalling. Firefox works fine in general, but YouTube pages are frozen and CPU use remains VERY high, suggesting that it might be a YouTube extension. So, I moved the two YouTube specific extensions into a subfolder (which didn't actually hide them from Firefox), but after it was up, I disabled every extension that I didn't also have running in Floorp. Eventually, the CPU usage came down but YouTube pages weren't loading. [I restored the two YouTube specific extensions for the screenshots of Firefox' disabled and enabled extensions (which all work fine in Floorp).] Meanwhile, Firefox CPU usage runs between ~1x and 15x with an average ~5x multiple over what Floorp is using.

Update: after stopping a page that Firefox complained was draining resources, Firefox started playing YouTube posts again. It's still a CPU hog (relative to Floorp), but it's running.

Modified by Mike Landis

Ask a question

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.