Gmail Preview Pane Extend userscript removes the right-sidebar in Gmail and extends Preview Pane to the full width of the screen. It works on Chrome and Firefox.
Browsers
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3 Column Reader is an extension that turns Google Reader’s classic look into a beautiful, three-column layout. The extension works on Google Chrome, Safari and Firefox – with Stylish add-on installed.
Layouts for Google Plus is a new Chrome extension that lets you personalize Google+ with a custom background image. Set images are visible on all pages and can be easily changed whenever you want.
GTools+ is an extension for Google Chrome that allows you to customize the Google navigation bar by reordering Google products links, changing the notification colors, hiding the links you don’t use, and more.
PostRank is an extension for Google Reader that provides an option to filter all uninteresting stuff out of your eyesight, and keeps you updated on posts and news items that matter the most.
+Comment Toggle is an addon for Google+ that gives you the option to hide/show all comments made on a particular post. Additionally it also shows the total number of read and unread comments count.
Google Light Navbar is a userscript for Google Chrome, Mozilla Firefox, and Opera that lets users customize the Google Navigation Bar color to anything they want
Open In RegEdit is a Mozilla Firefox add-on that lets you open registry keys specified on a webpage directly in Windows Registry Editor.
Shortcut Manager is a free extension for Google Chrome that lets you edit the browser’s default keyboard shortcuts, and create new ones that performs various browser operations, and execute JavaScript
Here are some advanced tweaks for the Firefox download manager. To access these settings, enter about:config in the address bar of the browser.