Firefox has a built-in feature that allows you to share web pages in just a few clicks. No add-ons or additional software required.

Click the share icon on Firefox. (See Customize Firefox controls, buttons and toolbars to learn more about moving buttons to a different position.)
If you're using this feature for the first time, choose the social network you want to add. Follow the prompts to log in.
Your favorite social networks will appear as icons.