Modified .xpi, still transparent menu Puntuado con 4 de 5 estrellas
Thanks for the instructions on changing the max version, it worked!
I modified the .xpi and uploaded it here: http://goo.gl/Ate3O for anyone wanting to save the time of doing it yourself.
I am still however getting the transparent menu when the context menu of autocopy is enabled. I know I can disable it, but I find it useful as I often select text and choose either 'search' or 'open in new tab'.