spammy? NOT! Rated 5 out of 5 stars
So-called "Spammy" NOT! This is a Unit Converter that is Simple and Easy to use, with a DISABLED BY DEFAULT Superfish-Option for Price Comparison which marries well when this involves products with stated Units of Measurement and different sites are using different Unit Standards. What the previous reviewer thought were "Ads" was just Price Comparisons being shown because the SuperFish Option was clicked. Just read what your clicking and you'll get what you want:)
With or without the extra option enabled, Just highlight a unit of measure, right-click, and the conversion is already there! :) Its in the menu with no further actions needed. This Addon is so simple and a wonderful time saver.
So either way you have Choice. You'll love this addon as I do:)