Mozilla Firefox is a free web browser with full of useful features, more interesting, there are many necessary add-ons to help you surf the web more effectively than ever before!
So, do you know how to install those add-ons, or extensions? Please, Download.com.vn, learn the steps to install the extension on Firefox!
Step 1: Open up Mozilla Firefox, click on the word Firefox (top left corner), select Add-ons (or use the shortcut Ctrl + Shift + A ).

Step 2: The Manage add-on window appears, type the name of the add-on to search in the search box, the corresponding add-on list will appear right below, find the correct add-on you need, click Install.
![Instructions for installing extensions on Firefox Instructions for installing extensions on Firefox]()
Step 3: Firefox will automatically download and install the add-on for you, after the installation is complete, click Restart now to restart Firefox.
![Instructions for installing extensions on Firefox Instructions for installing extensions on Firefox]()
Step 4: Then go to Firefor / Utilities / Extensions to see if that add-on has been installed.
![Instructions for installing extensions on Firefox Instructions for installing extensions on Firefox]()
Now you can use this utility, here you can also Disable, Delete or select some other options for this utility.
![Instructions for installing extensions on Firefox Instructions for installing extensions on Firefox]()
In addition, you can go to Download.com.vn to find some add-ons you need here .
Good luck!