A bit complicated to set up but working as intended. Developer isn't at fault though considering firefox new architecture limitations.

Good work.

Question to the developer, would there be a way to add a button to the tool bar to use the function "open with streamlink"?

Thanks for this addon!

Yes the installation is a little bit more work than other addons but it works perfectly when done correctly. (With my FF56 at least, assuming it will keep working with 57)

Maybe you could add the "What it does" to the AMO page?

Thanks again!