Chrome: If you prefer to use the built-in bookmarking feature in Chrome instead of an external service, you know that bookmarks can get out of hand pretty quickly. Bookmarks Tagger is an extension that allows you to tag your bookmarks so you can find them easily.
Bookmarks Tagger sits to the right of the Omnibar. When you want to add a new bookmark you simply hit the button, and add your tags. To search through your tags later, type "bt" into the Omnibar, hit Tab, and search whatever you like. If you prefer to keep your bookmarks on your computer and away from services like Instapaper or Pocket, Bookmarks Tagger is a good compromise that still keeps everything organised.