I would like if it had a Timeline and Effects along with Preview and a online version, and i would LOVE if it had an easy to use UI with a Text editor and a All-In-One script editor with captions 😄
Considering how understaffed and under delivering the Firefox (main product!) team is, and the lackluster reception the community has had regarding other Mozilla ventures, I'd say a video editor is quite far off the franchise scope for Mozilla.
Unless they can fix their organizational issues (such as CEO pay), that is.