View YouTube videos into a dark environment, like in a cinema.

Another good extension for Chrome is, again, made for YouTube. It will make the white area from the browser darken, so you will have the sensation that you're in a cinema. I really like the feature. Try it by searching "Turn Off the Lights" in extensions (extensions homepage is here) and selecting the second result (Mac users goes here). It has a button, on the right part of the address bar.

Here's a screenshot of how it looks like:

Chrome extension for viewing YouTube always in HTML5.

You have probably read my article about the new feature from YouTube, that one related to HTML 5 content (if not, go here). The extension I'm now telling you about, will try to deliver you the content from YouTube into HTML 5, instead of Flash Player. It is available for all platforms (Mac users goes here), and has no button, it only does what I've told you (in the background). It's an interesting extension, because you will know anytime that the content is viewed through HTML 5, if available.

Search it through extensions (https://chrome.google.com/extensions?hl=en-US) with the following name: YouTube HTML5-ifier .