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Problems with add-ons, plugins or unwanted software

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Add-ons that change your browser settings without your consent or steal your information have become increasingly common. Firefox will now verify that the add-ons you install have been digitally signed by Mozilla.This article explains the add-on signing feature.
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Support for NPAPI plugins in Firefox except for Adobe Flash will end in March 2017, when Firefox version 52 is released.Beginning in Firefox version 52, support for NPAPI plugins in Firefox has ended, except for Adobe Flash. Some of the plugins that will no longer load include Java,
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The message, "The Adobe Flash plugin has crashed," is shown when the Flash plugin stops working unexpectedly. Reloading the page will often get the video, game or animation to play again. If the Flash plugin continues to crash, updating to the latest version
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This error means that a plugin (like Adobe Flash) has crashed. Simply reloading the page will restart the plugin, and your video (or other content) will be shown again. Before reloading the page you can add a comment to explain how it happened and send a crash report to Mozilla by
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Support will end for all NPAPI plugins except for Flash in March 2017, when Firefox version 52 is released. See this compatibility document and this article for details. Beginning with Firefox version 52, support has ended for all NPAPI plugins except for Adobe Flash. See this
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Firefox and some plugins use your graphics card to help speed up the display of web content. Graphic cards are also used by advanced web features like WebGL. To fix problems with these features or to take advantage of them, you may need to update your graphics card drivers. This article
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An inability to install an extension can be the result of problems with the extension, Firefox preferences, or the version of Firefox you are using. This article describes various causes of install problems and what you can do to address them. Table of Contents1 Add-on is not compatible2
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We have received reports from many users who were interrupted in their browsing experience and who got redirected to a fake page purporting to provide an "urgent" or "critical" update and prompting to download a firefox-patch.js (or .exe) file. Some people have also
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This article describes how to uninstall an extension or theme that can't be removed by following the instructions in Disable or remove Add-ons or Remove a toolbar that has taken over your Firefox search or home page. If you are not able to uninstall a plugin, see Manually uninstalling
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This article will help you remove third-party toolbars like Ask, searchqu, MyStart, incredibar, seeearch, somoto, sweetim, uTorrent, and others from Firefox and restore your default home page, New tab page and search settings. For help removing the Babylon toolbar, see How to remove
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When you update Firefox, it automatically checks your add-ons and updates them to compatible versions when possible. If an add-on can't be updated and is no longer compatible, Firefox turns it off. This article shows you how to update those add-ons and get them working again.
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Babylon translation software adds a toolbar and other add-ons to browsers. It also changes Firefox preferences such as your home page and search engine. These changes are done in a way that can be difficult to detect and reverse. This article explains how to fully remove Babylon and
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Note: This article only applies to Mac computers. Adobe Reader installs the "Adobe Acrobat NPAPI Plug-in" for viewing PDF files inside your browser. If you use this plugin in Firefox, PDF files may be blank or you may see the message, Adobe Reader cannot show documents in
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Firefox lets you regain control of your settings in the event of a search hijacking. If Firefox detects a search hijacker, it fixes itself by resetting to the default settings. Search hijacking, or browser hijacking, occurs when a third party sneaks files into your computer and alters
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