Oct 29, · Firefox add-ons are the best way to add features to your browser, such as getting weather updates or managing passwords. They’re only useful if you know how to manage them. Once you’ve learned how to install, uninstall and turn them on and off, you’ll be a pro at using add-ons. Oct 07, · 1. Allow other extensions to send download requests to the external download manager from this extension (read FAQs page for more info) 2. Adds new file extensions to the default list ('.DEB', '.RPM', '.APPIMAGE') 3. Fixes the redirecting page is not working in the Firefox version/5(14). Viewing and managing your installed add-ons. Search engines can be viewed and managed in the Search panel in Firefox Options Preferences. For other add-ons: Click the menu button and choose Add-ons. The Add-ons Manager tab will open. You need to change the configuration to unlock the new add-ons manager. Note that it is only partially integrated in Firefox Nightly currently. Download Firefox extensions that can help download web, music and video content. You can also find extensions to manage downloads, share files, and more. While all browsers, including Firefox, have memory management built in, It works a lot like the popular Chrome extension, The Great Suspender. and then activate OneTab again, it saves the new tabs into their own group.