Google Chrome (Windows/Mac/Linux): If you tend to have tons of small, hard-to-read tabs open at a time, navigate through them with TabJump, a Chrome extension that lets you open recently closed tabs, jump to open tabs and group related tabs together.
We've all been there before — you open up Wikipedia for a five-minute break, and two hours later you have 30 tabs open. TabJump is a great tab manager for Google Chrome, that sits in the address bar and organises all your open and recently closed tabs, so you can easily navigate through your sea of open pages. Your open tabs are organised into two colums, one of which shows the tabs related to the one currently in focus, so you can quickly jump between open pages from the same site. You can also lock certain pages, protecting them from accidental closure. If you try to close a locked tab, you'll get a popup message from Chrome asking you if you are sure, preventing you from losing what was really important out of all those open tabs.
TabJump is a free download, works wherever Google Chrome does (Note: You'll need to be running the beta channel for extension support on Linux, and the dev channel for extension support in OS X). Thanks, MPS!
TabJump - Intelligent Tab Navigator [Google Chrome Extensions]