In the Firefox Orange menu bar, select Add-ons to open the Add-ons window in a new tab. This page allows you to search for available Add-ons and explore the nature of Add-ons generally.
In the Get Add-ons panel of the Add-ons window, search for an add-on by typing the search term in the search box at the top right an pressing Enter. A list of add-ons matching your search term will display.
Follow the instructions on the page to install any desired add-on. You may be required to review and accept the End User License Agreement. To continue with the installation, click .
To manage or remove your Extensions, click on the Extensions button.