As of December 2019, Video DownloadHelper is the third most popular extension for Firefox (after Adblock Plus and uBlock Origin) and the second most popular Mozilla-recommended extension with 2,848,968 users. Video DownloadHelper FireFox not working is the most common issue you may come across. When you download a video on FireFox browser, Video DownloadHelper can’t detect the video source or it fails to work. The issue is related to many factors so you can check out the following fixes based on specific conditions.
Video Downloader Professional Firefox
Firefox Streaming Video Downloader
I have some add-ons installed which keep disappearing from the top toolbar where I want them (next to the search bar). They include Video Download Helper and Self-Destructing Cookies. I entered Customize, and these add-ons are not shown in the 'Additional tools and features'. They are definitely installed as they show in the Add-ons Manager, but they are not at the top bar -- I have the bottom Add-on Bar Restored, and several of my add-ons do show there, but not those. There is no drop-down arrow indicating that they are actually there but hidden. They are not there.I'm assuming there's some kind of conflict, but I don't know what it could be. It doesn't seem to have anything to do with what theme I am using at the time. Thank you.using: Windows 7, Firefox 50.0.2