Brew Convert

UPDATE: I spoke too soon. While the extension instantly converted grams to ounces, it had no clue what a millimeter (mm) is. In the end, fail. Finally! Someone (this extension developer) has done it right! Right click on a unit of measure and see the conversion right there in the context menu. Brilliant. And bewildering how all other similar extensions totally screw up this simple process. But here, perfection. Thanks dev!