I use the Evernote Clipper since years and love this feature! Sadly it doesn´t work usefull since firefox need a certification for addons! Cause every time i open it i have to fix it again.
So please, is it possible you get this certification for your product?
I also tried to evade this problem by using the about:config and xpinstall settings of firefox. but that also didn´t work for me.
Your addon was befor so much timesaveing and usefull to me, i wish it become this again.
By the way i think it´s also in your interrest cause your great feature already drops down to 2 stars at firefoxs customer rating, only of the fact that lost its advantage!