Firefox CPU usage: Difference between revisions

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(→‎Plugins: suggested updating Flash; added Adobe Reader workaround)
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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.[http://momentarypause.blogspot.com/2006/02/firefox-cpu-issues.html][http://forums.mozillazine.org/viewtopic.php?t=184258]
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 PDFs, it's likely a problem with [[Adobe Reader]]. One possible fix is to create a WWW_OpenURL directory in the AdobeUM directory.[http://public.ok2life.com/welcome/index/54.html]
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

See also