Video DownloadHelper - Browser extension to download videos from the Web

FastestTube - Youtube fastesttube downloader will make your internet expirience faster harder beter stronger.‎How to merge video and audio .

Flash Video Downloader - Flash Video Downloader is a popular extension for Google Chrome browser for downloading wide range of files over the internet.

FlashGot - FlashGot is a browser extension for Mozilla Firefox that is designed to make it easy to download a whole batch of files in one go. The extension is open source and free to use, but it is no longer compatible with the most recent version of Firefox.

ClipGrab - A friendly downloader for YouTube and other sites

GrabAnyMedia - Grab Any Media is a popular video downloading extension for the web browsers.