Bulk Youtube Video Downloader is an add-on for the Firefox web browser that works both directly on Youtube but also on other pages that link to Youtube videos. The video downloader adds an option to the Tools menu and context menur that can be clicked whenever Youtube videos need to be downloaded to the computer. The add-on works both with Youtube video links and embedded videos.

Bulk Youtube Video Downloader is handy when it comes to downloading multiple videos from the video hosting site. It works for instance on the Youtube start page, profile pages, channels, playlists and websites that link to or have embedded a number of Youtube videos. Heck, it even works in Google Search and other search engines if they link to Youtube videos.

Some or all of the Youtube videos that have been found can be selected for download. Bulk Youtube Video Download supports both the flv and mp4 format and can prioritize HQ versions if available.

The Youtube video downloader add-on works even if Adobe Flash is not installed on the user’s computer which is another benefit of it.

Firefox users who want to give it a try can download the latest version of the Youtube video downloader from the Mozilla Firefox add-on page. (via Instant Fundas)

Bulk Youtube Downloader offers a different approach. The Firefox add-on can be used to snap all links that lead to Youtube videos from a specific page on the website. This works perfectly for instance on the Youtube homepage, channels, playlists and single video pages where not only the video that can be played but also the related videos are picked up.

The Youtube video page can be scanned by either right-clicking on the page and selecting the Bulk Youtube Video Downloader context menu entry or by running the add-on from the Tools menu in the Firefox web browser.

The add-on displays all Youtube videos in its interface. The configuration of the download takes place on the first screen. The user can select the videos to download by using the mouse or selecting them all with CTRL A. The video downloader will by default download the high quality versions of the videos if available and save them as FLV. Both of these options can be changed to download mp4 videos instead if available and to not download the hq versions if available.

The download destination can be selected and filters to filter out some of the videos. A click on the start button transfers all selected videos to the download queue of the web browser from where they will be downloaded to the local computer system.

Bulk Youtube video downloader displays a log window at this stage detailing failed and successful requests to queue the selected videos for download.

The Firefox add-on is especially useful for downloading playlists from Youtube but can also come in handy for channels and other themed video pages.

Bulk YouTube Video Downloader is available for all Firefox 3.x browsers. It can be downloaded from the Mozilla Firefox add-on repository.

The program is a little bit less comfortable than Youtube downloaders that come with their own search or browser. Users can either copy and paste single urls into the interface of the program or import text files that contain multiple Youtube links. The import only works if the text document contains one Youtube link per line.

A click on the Go button will initiate the download right away. The videos will be downloaded one after the other until the end of the queue is reached. By default high quality defintion versions of the video are downloaded from Youtube. It is however possible to change the quality setting to high quality or low quality instead. This will speed up the downloads a lot but reduce the quality of the downloaded Youtube videos.

YouDown requires the Microsoft .net Framework 3.5 Service Pack 1 and a Windows operating system. It can be downloaded from the Codeplex [via Addictive Tips] website.