upgrading to latest firefox (20) breaks it Rated 4 out of 5 stars

I depend on this add-on. Upgraded to latest firefox, build 20 and it is now broke. The sidebar opens but when I click on the feed nothing appears in the window to the right of the sidebar. I went back to firefox build 19 and sage is working again. This is my favorite rss reader so I hope you can find the time to fix it. Thank you.

This review is for a previous version of the add-on (1.4.13). 

This is a known issue with Firefox 20, a release that fixes it will be coming next week.

https://github.com/petea/sage/issues/86