I love this extension except is useless to me. I would love it more if it also had metric to Imperial / United States customary units. Please ad that if its possible. Thank you for a quick response. Would really appreciate a metric to standard extension. Would do it myself if i knew anything about coding.

This is a must-have tool! Thanks.
I have two suggestions:

1) Recognise American length writing style: 5'2" for 5 feet 2 inces

2) When I looked for the addons I thought it'd do this on:hover. Maybe add this as an option and optionally highlight text/values that were converted by the addon (so the user knows what was affected). It can get confusing when there're many numbers on a page and you don't know what was and what wasn't converted/changed.