Great idea, it's so annoying that even science sites don't use metric, for example a recent article about room temperature superconductors:

https://www.quantamagazine.org/physicists-discover-first-roo...

https://news.ycombinator.com/item?id=24777268

Those sites will be good test cases for the bookmarklet. And I see I have to add Fahrenheit for the next release.

This little bookmarklet helps with reading webpages that use "inches", "feet", "yards" and "miles" for people (like me) used to the metric system. (It can also handle in. ft. yd. mi.)