Rated 5 out of 5 stars

I've been holding back updating to v29 because of this extension: it won't work with FF v29.

I've tried what Didier suggested in other comments, to select another location to place it, but a JavaScript error don't allow that (Mac OSX Mountain Lion, FiFo v29.0.1)

I also have a Mac, could you send me the inforss.xml file , I will try to reproduce your config here.