Shows a blank screen Rated 3 out of 5 stars

I have been using this add-on for quite a few months by now.
It has been great; very easy and intuitive to use.
However, after fire fox automatic update couple days ago(I think), the add-on suddenly became a complete disaster.
After clicking on the capture button, it shows only a black page with function interface, but not actual screen capture.
Without a screen capture actually captured, this add-on is completely useless. Is there a way to fix??

This review is for a previous version of the add-on (2.4.3.1-signed).