Most useful add on ive ever used, so handy and simple.

Excellent! It does it job very well. This is what I was looking for among many other similar addons. Firefox must fix the search engine for extensions relevance, so we can find specific extensions faster and easier. It took me some minutes to end up on this add-on.

Excellent unit conversion extension. However, now I can't use it because of the new Firefox standards for extensions after updating from 56.0 to the newer Firefox. I can't even download it now. Nothin' like a hostile takeover of the base software for the sake of disruptive stringency.