Adware Rated 2 out of 5 stars

...that (stupid enough) places a floating fixed DIV on every page, killing scroll performance on older PC's.

This review is for a previous version of the add-on (1.1.2.1-signed). 

Thank you for the feedback

There is no advertising through the addon. It runs locally on your browser and does not connect to any webpage other than the one you visit (except for the dictionary and wikipedia functionality which is only triggered by a user action). It is possible that the website you visited had ads. and the addon was unable to remove all or many of them. Since the addon is compatible with NoScript and AdblockPlus, please try to use it along with those addons and that should help cut down the ads. you are seeing.

Regarding the performance problem, would you please provide the specs. of your computer:
(1) OS and version
(2) Processor speed and manufacturer
(3) Amount of RAM
(4) Firefox version

if I can find a similar hardware, I will test on it and see if I can reproduce the performance problem.