Right-click the extension download link (in Mozilla Add-ons, where it says 'Download Now'), select 'Save Link As...' and download/SAVE the .xpi file to your computer in a location where you can find it later for step 1 or 2 below. Then you can do one of the following:
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See: http://support.mozilla.com/en-US/kb/unable%20to%20install%20add-ons#w_you-are-asked-to-download-the-add-on-rather-than-installing-it
Other issues needing your attention
The information submitted with your question indicates that you have out of date plugins with known security and stability issues that should be updated. To see the plugins submitted with your question, click 'More system details...' to the right of your original question post. You can also see your plugins from the Firefox menu, Tools > Add-ons > Plugins.
Add-ons let you add bells & whistles to Firefox. You can get add-ons that compare prices, check the weather, change the look of Firefox, listen to music, or even update your Facebook profile. This article covers the different types of add-ons available and how to find and install them.
Table of Contents
You can install these general types of add-ons:
Viewing and managing your installed add-ons
Search engines can be viewed and managed in the Search panel in Firefox OptionsPreferences. For other add-ons:
For detailed information on disabling or removing add-ons, see Disable or remove Add-ons.
Here is an overview to get you started:
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At the top and bottom of the list of featuredrecommended add-ons, there's also a button you can click. It will take you to addons.mozilla.org where you can search for specific add-ons.
For advanced users: You can also install add-ons from a file. If you saved the installer file to your computer, (for example, an .xpi or .jar file) you can install the add-on using the gear icon in the upper-right area of the Add-on Manager Extensions panel. Select Install Add-on from file... from the menu, then find and select the file.
Some extensions place a button in the toolbar after installation. You can remove those or move them into the menu if you want - see Customize Firefox controls, buttons and toolbars.
For information on troubleshooting problems with extensions, plugins, or themes, see the articles below.
Problems with installing or uninstalling add-onsProblems caused by add-ons
Note: Mozilla has overhauled the underlying technology for Firefox add-ons. For more information, see Firefox add-on technology is modernizing.
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