This is a wonderful add-on. Finally I don't have to stand these ugly non SI units. It would be nice to also have the option to remove the Imperial altogether and provide a tool-tip if something was converted.
The basic add-on already deserves a 5/5, however. Thank you very much!

One thing which is funny is that the description says "Convenient for amazon shopping, cooking, etc." .... Tablespoons do not get converted yet, but then again which idiot would measure in spoons and then say it is an exact thing in the first place.... (ah yes, the internet)