Many changes; sorry for throwing them all at you in one pull.

**Changes:**
* Fixed the double-restart thing  
* Main button now changes to a smaller size if it's moved off the main toolbar or small icons mode is enabled  
* Added status bar (addon bar) button with a popup menu featuring prefs access and number of pending reviews/lessons  

**Bugs (all minor or I wouldn't have let this go):**  
* Statusbar icon isn't styled 100% correctly  
* No middle click support  

Tested over 24 hours on Fx17 (ESR) on Win7 and verified to work in Fx11 and Fx20 on a Debian VM. Sorry about the commit text; sometimes I forget other adults will be reading these.