FastestFox

FastestFox, formerly SmarterFox, is a popular productivity add-on. Save your time get faster, parallelized downloads auto-load the next page when you reach the end, search as you type from the URL bar, and search highlighted text with the pop-up bubble. FastestFox has some more options like Download all links, images, or media on a page in parallel, maximizing the use of your bandwidth, easily save page media such as Flash videos, flash games, and Shockwave movies on any YouTube-like site to your hard-drive, search by selecting or highlighting text and then clicking on the popup bubble, Visit bookmarks quickly with keyboard shortcuts using qLauncher.

Requirements:

Firefox 3.0 - 14.0