If you thought downloading YouTube videos in Safari was easy just wait until you try this cool new add-on for FireFox that allows you to download .flv files in the much more flexible .mp4 format.
- Go to Video DownloadHelper and select the appropriate version. After it downloads, restart your FireFox browser. You should see a strange, black-and-white, molecule-like icon next to the address bar.
- Now, simply open the YouTube page of the video you wish to download and, suddenly, the icon will become animated. Click on the small triangle next to the icon to open a tab of options.
- Select which file format you would like and click download. Select the destination folder and the the video will automatically convert to the desired format upon saving. You can open it using most major media players.
Good luck and stay legal!