To-do if it doesn't work with FF 4.0 and above Rated 5 out of 5 stars

If AutoCopy doesn't work, doesn't copy the selected text, open the Settings and look for the copy without formating option. If it's ticked, then uncheck it.Explanation: that function uses Copy Plain Text which addon isn't compatible FF 4.0 and above. After I unticked this option, AutoCopy works fine for me. (After I upgraded from 3.6 to 4.0 and now to 5.0, AutoCopy hasn't worked. Today I find the solution. :) )
Environment: Win7 32-bit, earlier FF 4.0, but I upgraded to 5.0 some minutes ago. WORKS FINE! :)

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