Gmail Notifier is an open-source project that notify you about incoming emails from all your Google Mail accounts and labels. So no matter if you manage one or a dozen Gmail addresses, you can keep them all in check with this fantastic extension.
This add-on removes text associated with your bookmarks and folders and gives you placement controls over bookmarks extending the functionality and usability of the Bookmarks Toolbar. Your Bookmarks Toolbar is now very Roomy and Smart!
Classic Style for Favicons is a very neat extension for the browser. This add-on for Firefox puts the favicon in the URL Bar and restores the old favicon behavior with secure sites identity background colors. Optionally doesn’t show the Tab Bar when only one tab is open.
QuickMark provides a lightning-fast way for creating bookmarks and keeping them organized. Create and place them in a folder in one mouse sweep or use the shortcuts so your hands won’t need to leave the keyboard. This comes in handy if you need a quick and easy way to bookmark a webpage you are looking at.
The HTTP Nowhere extension adds a button to your Firefox toolbar that lets you disable all unencrypted web requests and only permit those you choose. When URLs are blocked, an indicator appears on the button and you can then choose to allow or ignore them in the future. You can also manually manage your allowed and ignored URLs and quickly switch between enabled (red) and disabled (gray) mode.
The Open link in… add-on for Firefox adds context menu items for opening links and images in a new background tab (or foreground tab if your tabs normally open in the background), in a new background or foreground window, and in the current tab. Optionally gathers items into a submenu.
New Tab Tools will help you customize the new tab page. You can add more tiles, the launcher from Firefox start, or a background image. You can also set new tile images and other options (as you see in the picture above). This add-on really makes the new tab page a real feature rather than something that I get no use in at all. Want to pick it up? You can find the New Tab Tools add-on from the Firefox Add-ons website.
The Window and Tab Limiter add-on for Firefox will automatically close old windows and tabs. This is so you don’t end up with too many windows or tabs opened up at the same time. This will save you a lot of CPU resources. You can also password protect the add-on so nobody messes with your settings.
This add-on is a lightweight add-on that tells YouTube to load the video in HD straight away. Unlike other add-ons like it, YouTube HD causes no stall in the loading, no refresh of the page and does not manipulate the video object.