FYI, I just realized, I am not using the Add-On Bar Restored 3.2 at all. I have it disabled, but I still have the add-on bar at the bottom of my FF29 window and that's where Forecastfox widget data shows up. I believe the Classic Theme Restorer" already provides the missing add-on bar in my case.
It's all very confusing. If you asked me how exactly I got Forecastfox to work in FF29, I wouldn't be able to tell you. I was messing around with different add-ons, and somehow at one point it just showed up.