Google Chrome with their version of browser add-ons. Some very useful ones are available including Ad-Block, Dictionary and various quirky ones.
Any great ones you like, please share them here. My personal favourite is 'Beautify Facebook'.
Extensions, available for Google Chrome in Windows, are a great way to add more features and functionality to the browser. Sometimes, a feature is really useful for some people, but not for everyone. Extensions let you customize Google Chrome with features you like, while keeping your browser free of clutter that you don't use.
Here are the different types of extensions that you can find in the extensions gallery:
These extensions add a button next to the Page and Tools menus to let you conveniently perform a task (such as accessing a site or checking for updates) no matter what page you're visiting. For an example, try out extensions like Google Mail Checker.
These extensions can detect whenever you're on a certain type of page and display an icon in the address bar. Click the icon to do an action on the page. For example, RSS Subscription Extension displays a small icon whenever it detects a feed on the page you're visiting. You'd click the icon to instantly subscribe to the feed.
These extensions can directly interact with the page you're visiting. For instance, Google Translate adds a banner to the top of your page whenever it detects that the page's language is different from language you're using for Google Chrome. You can click the button in the banner to automatically translate the page to a language of your choice.