Extension Test Page

I made Firefox Add-on for automatic “translation” of pages to International Units (SI / Metric).

https://addons.mozilla.org/en-US/firefox/addon/everything-metric-converter/

After installing, try this page with Add-On Enabled and Disabled to check the conversion

A 2.5 ft long pipe with 3 inch diameter and 2 inch opening nas 1/2″ wall thickness.

Fractions can be written as 1½ inch or 1 1/2″ with or without dashes inbetween

Commas are supported for big numbers like 1,500 inch

Areas also work, whether written as
2 sq. ft or as 2ft²

A car travels 10 miles at speed of 80 mph and uses 35 mpg fuel

My height is 5’10” but I can write is as 5 ft 10 in, with or without dashes

It works on Amazon pages whether seller uses ‘x’ or ‘*’ between measurements, even with
width x length x height format
and extension replaces the whole text as there is often not too much space. See here:

19.7*13.4*7.9 Inch
19.7 x 13.4 x 7.9 in

Works for cooking:
1 lbs flour
3 fl oz milk
2 cups of sugar
3 gallons of olive oil
Bake at 400 °F for 10 minutes

Since a lot of people use quotes for inches, other extension make issue when we see:
program version “1.0”
but not this extension

Cosidering in how many ways one can write inch symbol or foot symbol, the extension cannot be perfect, but I hope it simplifies internet browsing for people outside of USA, and people of science within USA.