Firefox add-ons are applications that allow you to enhance your browser by adding functionality and style.
You can check the weather and news, block ads, download videos, take full-page screen shots, customize tabs, play games, compare prices, backup, interact with social media, and so much more, just by utilizing Firefox add-ons.
From your menu bar, simply click Tools > Add-ons, and you can browse or search through the hundreds of thousands of add-ons available.