I find it hard to believe that speed is really the issue here. I suspect it's more likely it's the aggressive advertising scheme in which Google push for Chrome.
I think these projects which Mozilla test/launch are an indication that even they don't know how to stop the eroding of Firefox market share.
If I were Mozilla I'd be seriously worried about Electron.
Speed is definitely an issue on the mobile app. Personally I think Mozilla should try harder with the mobile market. Providing an ad and tracking blocking browser is still desirable on Android. Firefox is just too slow at the moment.
I really hope Mozilla take Servo and prop it up as an Electron competitor, as it might actually make a chance there and its incomplete compatibility with hacks used in the old days of the web are not that much of a problem there.
I think these projects which Mozilla test/launch are an indication that even they don't know how to stop the eroding of Firefox market share.
If I were Mozilla I'd be seriously worried about Electron.