One of the most annoying aspects of today's web is all the clutter. Side columns, blinking ads, "Read this next!" suggestions—it's enough to make you go mad, especially when you're trying to focus on getting something done.
Fight back with Evernote's Clearly, which strips out all the peripheral content so you can just get to reading. While other extensions (like Readability) do the same, this extension adds in the ability to mark up and highlight the article for easy saving to Evernote.
Chrome is dabbling with its own native reader mode, but Clearly is a longstanding tool that is essential if you're an Evernote power user.