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That's a browser's default behaviour when the location is requested without user interaction. In this case they request the location immediately when opening the page, they're supposed to add a "Use my location" button and in that case the browser would remember the decision for the current session.

It'd even keep happening if I click allow? (That's what I was doing, and it kept prompting over and over.)

They do have a locate button, but even clicking that didn't change the behavior.

Yes. The restriction on the Location API are pretty strict.

Same. Fun sight, but pretty annoying on FF.

Hmm, not here: clicked it away once and it never appeared again (110;0 on Win10 btw)

Same on Safari when I change airports (and I have to decline every time).