SUPERB!! Rated 5 out of 5 stars
At last, exactly the functionality I have been looking for, fantastic for research sessions. This is a must-have extension, for me at least. Thanks again!
ONE CAVEAT (at least one I have not seen mentioned here yet) - I now see yellow tooltips on absolutely EVERYTHING, including plain text on web pages. The tooltips are often irrelevant or relating to other areas of the Firefox interface.
This is extremely annoying, and much as I love this extension, it will finally force me to uninstall and await a later version if it is not fixed soon. Tooltips should appear over images and links and that's IT.