Having a hard time reading on the web? Is that website with the ridiculously small font and hot-pink-on-slightly-darker-hot-pink text raising your blood pressure? If so, this is the extension for you!
Whichever web page you visit, use this tool to search over linked content. Just click the "G"-with-chain-link icon in your status bar to open or close the toolbar (or ctrl-alt-s). Great for searching from tables-of-contents, bookmarks, or blogs!