Cause: There are several causes. We list a few here.
Solution #1: Update Firefox.
It is always a good idea to use the latest public release version of Firefox, since it will contain the most recent fixes. You can download and install the latest version of Firefox from www.mozilla.com. Doing so could disable Extensions or Themes if they are likely to cause problems.
If you are using Firefox 1.5 or later (1.5.0.x), the latest updates can be downloaded and installed from within Firefox. Simply open the “Help” menu and choose “Check for Updates”.
Solution #2: Check for problematic extensions A list of problematic extensions is maintained at http://kb.mozillazine.org/Problematic_extensions.
If an extension you use appears in the list and is known to cause crashing or hanging, update it to the latest version or uninstall it from Firefox until a fix is available.
Solution #3: Update Extensions
Every time a new version of Firefox is released, extensions need to be updated so that they are compatible. However, irrespective of your Firefox version, it is always best to use the most recent release of any extensions that you have installed.
Not all extension updates will be available through Firefox’s update system. You may have to find updates for these extensions manually by visiting their homepage and installing the latest version over the top of the current version. You may also find extensions at the following sites:
Note that if you instal extensions from sites other than Mozilla Update then you do so at your own risk!
Solution #4: Update Plugins
As with Firefox and Firefox Extensions, the latest versions of the plugins are always the best. You can find plugins at Mozilla Update’s Plugin page (https://pfs.mozilla.org/plugins/?application=firefox) and PluginDoc (http://plugindoc.mozdev.org/).
Plugins that are known to cause crashing in Firefox if they are not updated include:
* Macromedia Flash (www.macromedia.com/go/getflashplayer)
* Real Player (www.real.com)
* Real Alternative (www.codecguide.com/about_real.htm)
* Java (www.java.com/en/download/)
Solution #5: If you’re having problems downloading files Close Firefox, then search for and delete “downloads.rdf” from your hard disk. You will need to search for hidden and system files. You may also be able to solve this problem by clearing the Download History from the Clear Private Data tool.
Solution #6: Some programs could be causing Firefox to hang. Having Microsoft AntiSpyware running in the background has been known to affect Firefox. If you’re experiencing hangs running both these programs at the same time, turn off MS AntiSpyware. Also, McAfee AntiVirus can stop Firefox from operating correctly. To fix the problem, open the virus-scan Console, and go to Access protection > Prevent downloads from the World Wide Web, and add “firefox.exe”.
Solution #7: Try a standard diagnostic. If all the above have been ruled out as causes of your problem, try the standard diagnostic at http://kb.mozillazine.org/Standard_diagnostic_%28Firefox%29.