Firefox CPU usage: Difference between revisions
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==Only on specific pages== | ==Only on specific pages== | ||
=== Plugins === | === Plugins === | ||
If you're only having problems with sites that use [[Flash]], use the [http://flashblock.mozdev.org/ Flashblock] extension to selectively enable or disable it | If you're only having problems with sites that use [[Flash]] and updating to the latest Flash version doesn't help, you can use the [http://flashblock.mozdev.org/ Flashblock] extension to selectively enable or disable it [http://momentarypause.blogspot.com/2006/02/firefox-cpu-issues.html][http://forums.mozillazine.org/viewtopic.php?t=184258] | ||
If the problem happens when viewing | If the problem happens when viewing PDF files in the browser, it's likely a problem with the [[Adobe Reader]] plugin. One possible fix is to create a "WWW_OpenURL" directory in the "AdobeUM" directory [http://public.ok2life.com/welcome/index/54.html]. Another workaround is to disable the browser plugin and so that PDF files open in Adobe Reader as an external application, explained [[Adobe_Reader#Disabling_the_browser_plugin |here]]. | ||
=== JavaScript === | === JavaScript === |
Revision as of 01:42, 8 April 2007
This article describes how to prevent or work around high CPU usage in Firefox.
Only on specific pages
Plugins
If you're only having problems with sites that use Flash and updating to the latest Flash version doesn't help, you can use the Flashblock extension to selectively enable or disable it [1][2]
If the problem happens when viewing PDF files in the browser, it's likely a problem with the Adobe Reader plugin. One possible fix is to create a "WWW_OpenURL" directory in the "AdobeUM" directory [3]. Another workaround is to disable the browser plugin and so that PDF files open in Adobe Reader as an external application, explained here.
JavaScript
Some sites can cause high CPU usage through extensive use of JavaScript. You can disable JavaScript selectively using the NoScript extension.
Firefox bugs
Report the site using Help -> Report Broken Web Site. Reporting the problem will help Mozilla track down any bugs in Firefox.
All the time
Extensions
Problematic extensions can cause excessive CPU usage.
Windows Compatibility mode
Firefox can cause excessive CPU usage if it's set to run in compatibility mode for an older version of Windows.[4] To fix the problem, right-click on the Firefox icon you click to start Firefox, click Properties, click the Compatibility tab, make sure the check box under Compatibility mode is unchecked, and restart Firefox.
Hardware acceleration
Disabling cursor and bitmap hardware acceleration on some video cards and drivers can reduce CPU usage when displaying images.[5]
Related bug reports
- Bug 213637 – Mozilla runs at ~100% cpu usage after connection is interrupted or wakeup from hibernate or standby
- Bug 265172 – Hang and 100% CPU usage sometimes during restore/resume from sleep/standby/hibernate - update your flash player