Boomerang allows Gmail users to postpone sending messages, something that’s sorely missing from the default user interface. It’s especially useful if you do business with people in other time zones (or continents), so that you don’t accidentally send that invoice request at 3 a.m. The service also includes reminders, which are handy if you’re waiting on a response, and applications for Android and iOS that let you use Boomerang when you’re away from your computer.
This one is for people who spend most of their time watching videos on YouTube cannot escape its vortex. I am one of those people and the Magic Actions extension for YouTube has been a great partner in crime for me. The extension brings a ton of features like Auto HD (always play videos in HD), instant control over volume by scrolling mouse wheel, Cinema Mode, 1-click snapshot, day/night toggle switch, managing watch history, and more. If you spend a lot of time on YouTube, you should definitely give this one a try.
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Since the untimely demise of Google Reader, Feedly has taken over as the de facto standard for RSS readers on the web. It’s quite possible to use the service in your browser without trouble, but for quick access and an isolated window, the official extension is very handy. It also adds a Feedly Mini icon to the bottom-right corner of sites with compatible RSS feeds. If this bothers you, it can be disabled across the web, or only on specific sites.
Chrome also has a thriving extension ecosystem and there’s probably also a Chrome extension for most everything you’d want to do. Chrome places more limits on its browser extensions so they can’t be quite as powerful as they are in Firefox, but these limits allow Chrome to present a permissions system and restrict extensions a bit more for security.