Find and install add-ons to add features to Firefox | Firefox Help
https://support.mozilla.org/en-US/kb/find-and-install-add-ons-add-features-to-firefox
WebAdd-ons let you add bells and 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.
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