Downloader stops downloading all over sudden on YouTube. The remedy to this problem is always to download the latest versions of adds-on.ģ. Failure to download Facebook videos and other special videos such as VEVO music videos and full-length movies. This problem can be addressed by disabling this add-on when not in use.Ģ. Typically, Firefox uses between 200k to 300k of RAM but when left running it utilizes gigabytes. If left enabled, it slowly eats up RAM making the computer slow. The best solution you can use here is to download YouTube to MP4 on Chrome, Firefox, Safari or other browsers directly. Part 1: Troubleshooting on Firefox MP4 Downloader Not Workingĭo you have a collection of YouTube videos in MP4 that you want to save on devices so to access to anytime of the day? You simply don’t want to go through the arduous process of accessing your YouTube videos when you go online. Part 2: The Best Alternative to FireFox MP4 Downloader.Part 1: Common Issues and Solutions on Firefox MP4 Downloader Not Working.3.7 Download Free MP4 Movies for Android.