posted a year ago
No, apparently Mozilla does not want Addons, which access core browser elements anymore. Addons which modify web content are fine for them, but core browser elements - no way.
I really would like to port it. But with this interface its just not possible, because WebExtensions intentionally do not support the required functionality. Just read this bug report which is about one of the blockers: https://bugzilla.mozilla.org/show_bug.cgi?id=1246706