Basically we have 2 days to make Sciter open-source (GPL or MIT, depending on the amount collected). I think landing a mature cross-platform desktop app framework which is not beholden to any browser vendors is a huge goal. It will have significant consequences for the desktop app ecosystems on all major platforms. Please take part.
So this adapts to different browser engines?
I think this will play in favor of Electron. Because its important to have more control, where you can customize and adapt the customize background engine.
The other thing to take into account is that Chrome itself will want to compete in this vertical, with little modifications a Javascript "application" that reuses the same browser engine you already have in your machine (BTW, I think there is something called 'Carlo' that basically achieve that).
This is a really brutal market to compete, so i'm inclined to think the opposite. Its hard to propose real value here , and if you don't do it, its hard to beat more well established propositions.