Everything Metric - Auto Unit Converter

About

Automatically translates all sites from American/old British units to International System of units (SI/Metric) - adding converted unit in a bracket behind original units.

Example: 10 feet 🠚 10 feet【𝟯 𝗺】

​Convenient for shopping, cooking, etc.

(You can also use Alt+M for manual conversion of the page)

Inch, Feet, Yard, Mile -> Metre (Meter)
Pound, Ounce, Stone -> Kilogram
Gallon, Quart, Pint, Fluid Ounces, Cups -> Litre (Liter)
mpg -> L/100 km
mph -> km/h
Fahrenheit -> Celsius/Kelvin
Area conversion for ft, yd, in, mi, both as "sq. ft" and "ft²" (must not be superscript); the same is for volume conversion.
Supports Amazon, Ikea, and other formats: 10" x 20" x 3" will be converted and replaced with metric units
Combo units also supported: 1 ½″​【𝟯,𝟴 𝗰𝗺】 or 2’−4″​【𝟳𝟭 𝗰𝗺】
Features most possible ways these units are written with dashes, quotes, apostrophes, Unicode units, etc. 

Toolbar button to turn extension ON/OFF globally
You can keep it off and just run when needed by pressing Alt+M

Permission to read page data is required to be able to change units.
Permission to storage is required to save settings.

Don't forget to check Options page.

Not working on a specific site? Have a suggestion for improvement?
Send me an email with details.

Source code is here https://github.com/m1l/Everything-Metric

Disclaimer: Author is not responsible for any damages, including cakes that are too sweet, because of miscalculation or any other issues.