Foot Size — is my size in this list?

Enter your foot length in centimetres. The extension remembers it, so you do that once. After that, when you land on a shop and see a row of sizes, select it, right-click, and pick "Is my size in this list?". You get a yes or a no, plus the sizes it found. The reason this is not just another converter is that size rows are written badly. I went through one catalogue of 149 pairs and the same three shelves were written six different ways: 42 42.5 42½ 42⅓ 42⅔ 42 1/3 That last one has a double space in it, straight out of the seller's own listing. Searching the page for "42" finds some of them and misses the rest. This finds all six. It does not ask for access to any website. It only ever sees text you have selected and right-clicked on, so it cannot read the pages you browse and does not know what they are. Your foot length stays on your own machine. Two things it will not do on purpose. It will not give you a US or UK size, because the published charts contradict each other and I would rather say nothing than hand you a number you might buy a shoe on. And if your measurement falls outside the table it tells you so instead of rounding to the nearest edge. Free and open source under MIT: https://github.com/ntx4891-dot/foot-size