Maintain extension for other browsers

[Madis0]

Hello,

I see that you have stopped the development of this extension due to it being removed from the Chrome Web Store. But have you considered porting and continuing it on other browsers?

Check out the relevant documentation for Firefox, Opera, Edge.

[Dezegar]

When trying to run WebExtension on Firefox 58 (Beta), I get following:

It might not be too far from compatible, maybe(?). It would be great, if it worked for Firefox as well.