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.

Video DownloadHelper - Browser extension to download videos from the Web

ClipGrab - A friendly downloader for YouTube and other sites

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

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

Easy Youtube Video Downloader Express - Easy Youtube Video Downloader Express is one of the best YouTube downloading extensions for the Mozilla Firefox that lets the Firefox users to download all type of YouTube videos via the downloader of their favorite web browser.