Rated 4 out of 5 stars

Almost perfect. Coming from Opera, I've gotten so used to 1 & 2 switching between tabs, and 0/9/6 for zoom + / zoom - / reset zoom. Key Config gives me that with zero effort. I gave 4 stars not 5 because there is very little documentation, and I can't figure out how to get to the settings in Firefox 30. (I wouldn't dock a whole star for requiring a restart, but since I'm already complaining I might as well nitpick.)