> They did not "artificially limit" the extensions available, you are misinformed. They certainly did – https://github.com/mozilla/video-bg-play https://github

> They did not "artificially limit" the extensions available, you are misinformed. They certainly did – https://github.com/mozilla/video-bg-play https://github.com/mozilla/video-bg-play for example is a very simply content script which doesn't use any special extension APIs at all and so would have worked right from the start, yet it still took several months until it was eventually added to the list of officially "blessed" add-ons.