Rated 2 out of 5 stars
Most important: Tested on FF4 and it does NOTHING for me! Chose russian rubles as target and visited ebay.de and amazon.com, but none price was converted. Also not after clicking the statusbar icon...
More criticism: Addon says NOTHING how / if / from where it updates the exchange rates! So this is totally intransparent!
Besides there are only 3 currencies from which it can convert! This really does not make it powerful... And as said, it just did not work for me at all!
Strange..It happened to me too when firefox was updated from RC2 to 4.0
But then I uninstalled and installed the add-on and Firefox several times and it was not reproduced any more. It just started working as expected.Please try one more time..Thank you