Rated 1 out of 5 stars

Is this a joke? The button is greyed out and it doesn't do anything. At least the version prior to this update *looked* like it was doing something.

This review is for a previous version of the add-on (3.0.3). 

try 3.0.3 or...

try setting browser.sessionstore.enabled to true in about:config. Just enter about:config into the location bar, hit enter, read the disclaimer and search for the above. Right-click the line and hit reset or just double-click the line to reset the preference. Let me know if that works.