Support for MP4 Downloader has been discontinued.
I don't have the time anymore to keep up with all the breaking changes that Mozilla is making in add-on development for Firefox, in addition to reacting to changes in YouTube, Dailymotion, and Vimeo that affect video downloading. The current version of MP4 Downloader has some features that are broken because of this, and once Mozilla drops traditional add-ons in favor of WebExtensions (something that I, and many others, don't agree with), MP4 Downloader will stop working entirely. (This change is planned for Firefox 57, which will be released in November 2017.)
The codebase has been left in the middle of a complete rewrite (see the Source Code section of the Development page). That codebase, and this website, are left here for archival purposes.
To sync a video to your iPod, follow these steps:
If this is the first time you are importing an MP4 Downloader video to your iPod, you may need to enable movie syncing by following these steps:
If you get a message saying that the video won’t sync because it is in a format that the iPod doesn’t understand, select the video in iTunes, go to the Advanced menu, and select Create iPod or iPhone Version.
If you have any issues syncing a video to your iPod, please contact us and we will be pleased to help.