Well good thing you're building. Extension wallet has been on my to do list also since none exist! But I don't have the time. I had an idea to call it hermes, extension wallet with Zeus functionality for lightning, ecash, liquid and main net all in one extension with swaps between them all built in. That's why it's called Hermes. Greek God of trade and balance. Also a nod to Zeus. But I'll never have time to build it. There are no good lightning browser extensions either and I almost can't believe that.