Chrome/Opera: When I start reading about any subject on the web, it's easy for me to go from link to link and have a whole bunch of tabs open. Grouping and bookmarking them is a pain, and sometimes I just forget to do that. But CottonTracks doesn't.
This new extension for Chrome and Opera smartly bunches together links from your browser history and your bookmarks to give you small "collections" of a subject. It takes a pretty long time to go through your history and work its magic -- over 2 days in my test -- but once it's done, the results are pretty neat. Each subject is presented as a "card", which you can favourite, delete and add more links to. There's also a nifty search bar to find what you are looking for quickly.
It's also got a neat highlighting tool. When you are on any web page and want to remember one part of it, highlight it with your mouse and hit the CottonTracks button in the toolbar -- the app will remember and display it when you open that card.