Chrome: If you're a Google+ user and want access to notifications and the ability to post or respond to your circles without having to switch to a Google site, this Surplus extension will do the trick.More »

Firefox/Chrome/IE: Swidget is a browser add-on that swaps banner and box ads for useful widgets, like the weather, news headlines, or even your Facebook feed. More »

Chrome: Lifehacker reader Benjamin Dykstra, a.k.a. jetRink, has published a nifty Chrome extension that notifies you when you get new followers or replies to your comments on the whole family of Gawker sites. Another handy feature is the ability to save discussion threads.More »

Firefox/Chrome/Opera: Interfacelift is one of our favorite sites for high-resolution wallpapers, but the added clicking required to get to the right size is a pain. InterfaceLift Resolutions Links is a userscript that adds direct links to each resolution right on the download page. More »

Windows, Mac, Linux, and Android: Mozilla has released Firefox 5, the first update for its new rapid-release three-month development cycle.

If you're stuck on an office computer and forced to use Internet Explorer because your system is locked down, Google has your back. The new version of Chrome Frame brings the features of Google Chrome to IE and doesn't need administrative rights to your PC to install. More »

Chrome: YouTube is great, but some of its features are annoying. With the YouTube Options for Google Chrome extension, you can suppress in-video ads, remove comments, disable annotations, and more. The extension allows you to completely change the look and feel of YouTube. More »

Firefox/Chrome/Safari/Mailplane: Rapportive, a plugin which we've previously mentioned for its Gmail-enhancing powers, has recently added Twitter capabilities. So now you can follow, reply to, and retweet your contacts—all without leaving Gmail. More »

You can access most of Chrome's settings from the Wrench menu, but it's a bit cluttered and hard to navigate quickly. Free extension Mega Button puts shortcuts to some of Chrome's most accessed settings right in your toolbar. More »

The web is filled with opportunities to humiliate yourself. You reply all with a scathing takedown of your boss; you post pictures on Facebook of a drunken night out and your mom starts to worry; you accidentally tweet a picture of your downstairs business to the internet at large. This simple tool helps you protect the privacy of your Weiner whenever possible.

Internet Shame Insurance is a very simple Google Chrome extension that adds privacy reminders to Facebook, Twitter, and Gmail to help you avoid the most common online communication faux pas. The extension sits in the background and springs into action only when you're about to post a status update or reply all.

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Google Chrome's stable release has now reached version 12, bringing hardware acceleration for 3D CSS, better in-browser privacy for the built-in Adobe Flash Player, and safer downloads. Chrome 12 will automatically scan downloads to check for malicious files, warning users when they're found. With the new updates comes a loss, though, as Gears is now officially kaput—which means no more offline Gmail access for Chrome users. The update will automatically take place over the next couple of days. [Download Google Chrome via Google Chrome Blog]More »

Google Chrome: RSS Alert is a tiny extension that pops up desktop notifications for updates to RSS feeds that you tell it to watch for you. The notifications are instant, unobtrusive, and they go away as soon as you click the links they're presenting (or close them). Unlike heavier services like Google Reader, the RSS Alert extension won't automatically find a feed for you if you give it a web site's URL—you need to give it an actual feed URL, but the extension can watch as many feeds as you want. RSS Alert works with all major feed types currently in use today.More »

Tabulate! is a Chrome Extension that allows users to quickly share every tab in their active browser window with a single link. The extension uses the previously mentioned BridgeURL service, and adds a small button to the top bar that automatically copies a BridgeURL link to the clipboard. The BridgeURL link leads to a page with individual links to every page that was tabbed in the original Chrome window, along with an option to open them all at once. More »

Chrome: This free dictionary extension from Google lets you view definitions from within web pages you visit. Just double-click a word to see its meaning in a pop-up bubble or get in-age translation of a foreign word.More »

Google Chrome: People who spend a lot of time on Wikipedia may find this extension particularly valuable, even if it is somewhat limited. With WikiPreview installed, any time you hover your mouse over a link to another Wikipedia article while on the site, a small snippet pops up to show you what that article's about.More »

Firefox/Chrome: When government officials seized ownership of a number of domains last month, a lot of people suddenly found their favorite torrent tracker shut down. Many owners of the seized domains simply moved to new URLs. If you're looking for them, the MAFIAA Fire extension uses a crowd-sourced database of alternative domains to connect you. More »

Evernote's Google Chrome extension got a major upgrade today with improved functionality and usability, plus a great new interface. Among the improvements: easier ways to clip blog posts, notes browsing within the extension, and more search engines integration.More »

Windows/Mac/Linux: After the release of Firefox 4, Firefox moved

<!-- videoId: aFWP-nltqfk --><!-- /videoId: aFWP-nltqfk --> Firefox: LessChrome HD is a Firefox extension made by the folks at Mozilla that hides Firefox's address bar by default,

Chrome: "Bus Times for Google Maps" is an extension that lets you quickly view upcoming transit times for your favorite public transportation routes by just clicking or hovering over an icon at the top of your browser window. Since the extension pulls data straight from Google Maps, it works with bus, light rail, subway, trolley, or just about any other transit lines that can normally be mapped.More »