Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
- Revision id: 10056
- Creator: Michael Verdi
- Comment: Added # before calling new template per https://support.mozilla.com/en-US/forums/contributors/704979#post-7926
- Reviewed: Yes
- Reviewed by: Verdi
- Is approved? Yes
- Is current revision? No
- Ready for localization: Yes
- Readied for localization:
- Readied for localization by: Verdi
If you are having problems with pages that use plugins (such as Flash, Windows Media Player, Java, and more) 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.
Table of Contents
Determining if a plugin is the problem
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 , click and select .
- Select a plugin in the list and then click its button. Repeat this step for each plugin in the list. You do not need to restart Firefox for the changes to take effect.
- Test for your problem. If it does not occur, go back to the Add-ons Manager tabwindow and re-enable plugins one-by-one with the button until you find which one causes your problem to occur.
If you find that disabling a plugin fixes your problem, continue following the steps in this article.
Updating or re-installing your plugins
Many problems with plugins can be solved by updating to the latest version of the plugin.
If updating to the newest version of the plugin or reinstalling it does not fix the problem, you can leave it disabled.
Manually uninstalling a plugin
If you can't use an uninstaller program to remove a plugin, you can remove it manually:
- Type about:config in the address bar and press EnterReturn.
A warning page may appear. Click to continue to the about:config page.
- Search for the preference: plugin.expose_full_path.
- Double-click on the plugin.expose_full_path preference in the list to change the value to true.
- Enter about:plugins into the Location bar to display the About Plugins page.
- Each entry in the About Plugins page will have "File name:" followed by a path. Use Windows Explorer to navigateNavigate to the folder shown for the plugin you want to remove.
- Rename the file to something other than its normal name - e.g. npswf32 becomes Xnpswf32
The plugin will be removed.
Re-initializing the plugins database
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:
Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.
- Click the menu button , click and select .From the The Troubleshooting Information tab will open. menu, select .
- Under the Application Basics section next to Profile FolderDirectory, click . A window will open that contains your profile folder.Your profile folder will open.
- Click the Firefox menu and select .Click the Firefox menu at the top of the screen and select .Click the Firefox menu and select .
- Delete the pluginreg.dat file.
- Open Firefox
- In the Location bar type about:plugins and press EnterReturn to bring up the Firefox plugins list.