If you are having problems with pages that use plugins (such as Adobe Flash, Java and others) to display content, you may need to check to see whether a plugin is causing the problem.
Common problems caused by plugins include:
This article describes how to troubleshoot plugins. If you are having a problem with an extension or theme, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems. For general information on plugins, see Use plugins to play audio, video, games and more.
You can selectively disable plugins while Firefox is running. If you suspect a certain plugin, disable it first, then test for your problem. If you don't know which plugin to disable:
Click the menu button and choose Add-ons. The Add-ons Manager tab will open.
If you find that disabling a plugin fixes your problem, continue following the steps in this article.
Many problems with plugins can be solved by updating to the latest version of the plugin. To check if any of your installed plugins are out of date, visit Mozilla's Plugin Check & Updates page.
If updating to the newest version of the plugin or reinstalling it does not fix the problem, you can leave it disabled.
If you can't use an uninstaller program to remove a plugin, you can remove it manually:
The plugin will be removed.
In some cases, you may not be able to install or re-install a plugin. Re-initializing the plugins database may fix this problem:
Open your profile folder:
Click the menu button , click help and select Troubleshooting Information. The Troubleshooting Information tab will open.