Start the program Mozilla Firefox. Then click on the orange button in the upper left corner and select "Settings", tab "General" click on "manage add-ons" or after clicking on the orange button right, select "add-Ons". In the window that appears, select "Get add-ons". On the opened page you can select the extensions of the sections of "Recommended" and "rising".
If none of the presented amendments has not caused you interest, you can search or browse the full list of available extensions. If you choose the first option click on the field "Search for add-ons" at the top right of the page, enter the required search criteria, and press Enter. This will open a list of results from which you can choose. If a suitable option was not, specify other search criteria.
To see the full list of available extensions, click on the link "Browse all add-ons" on the tab "Get add-ons", or click the link https://addons.mozilla.org/ru/firefox/extensions/. Here you can view the extensions by popularity, number of downloads, date added, a particular category.
After you have found an interesting Supplement, click on its name. Opens your personal page of the extension. Here you can find a detailed description of the changes between versions, view screenshots, read reviews or leave your own, to find out the name of the developer. To install the extension, click on "add to Firefox".
This will open a window displaying the progress of the file upload. At the end of process a warning will appear about the beginning of the installation of the extension. To continue, click "Install now". Next, you will prompted to restart Firefox, that extension came into force. Click the appropriate button.