Firefox support?

[domenic]

Hey, great-looking extension. I'd love to be able to use it on Firefox!

I anticipate from previous issues you don't want to maintain such a submission yourself, which is reasonable. But, I thought I'd open this tracking issue for others to express their thumbs up (no "+1" comments please, use the reactions feature) and for maybe one day someone who has more free time than either of us to take on the task.

Thanks!