[Firefox] Pop-up menu doesn't show when using prospector oneliner add-on

[volia1]

Actually I thought it's normal since oneliner had that bug, but now it's updated and GM&Stylish can produce their pop-up menu (Don't test another add-ons yet). But when I clicked uBlock, it couldn't show the pop-up menu.
Can you fix this?
I'm using 37.0a2 on win8.1 anyway.

Thanks

[gorhill]

Duplicate of #549?

[volia2]

It's different add-ons. Oneliner is mozilla's add-ons, but Pentadactyl isn't. Also I tried using the code in #549, and it doesn't work.
Anyway these are GM's and Stylish's pop-up menu when using oneliner http://puu.sh/g0H1k.png http://puu.sh/g0H1T.png . And this is ublock http://puu.sh/g0H2e.png