Gmail Buttons

Yettwasezmel 2 ɣef 5 n yetran

sɛur zpirit di March 15, 2016 · aseɣwen yezgan

I crave for this addon to work but I get a strange error when trying to use it. Whenever I open a mail I get a popup with the header "[Javascript Application]" and window body being:
closing socket2

1 NO Empty username or password. **************** "

The **** are actually a random string of lower case letters and numbers with that length.