Definitely a bug. Are/were you on 0.4.6? Someone else mentioned this being a result of µblock, but even with that installed, it should now be working correctly.
No idea to be honest, just glad to hear it was a bug. Given it was more or less non-functional I was erring towards "bug" over intentional to begin with. :)
The button didn't work and I'm leaning towards this being a bug. If this is intended, I'll be uninstalling. I do not approve of this behavior in apps.