One of the main reasons why Firefox is our personal browser of choice isbecause it’s an open source software project with a development communitythat releases very helpful add-ons and tools to extend its capabilities beyonda Web browser, turning it into a Web development tool, in many cases.You can find Firefox add-ons at https://addons.mozilla.org/firefox.You can find add-ons for just about everything from the appearance of yourFirefox browser to browser-based games. At the time of writing, Mozillareports that 2,139,478,273 add-ons have been downloaded...