absolute garbage... constantly asks you to update your location... In metric...

Useless, super complicated. I can't find the way how to update location, icon just opens pages, right click opens menu where you can't change anything.

it works for google maps, but for some reason it doesn't work for open street map.

It works, BUT changing settings is the most unintuitive thing. The addon is not self contained and depends on external site.

I follow this review 5 star rating

I have trouble finding the options menu to force a spoof location change. As a result, apparently my true location is still returned.
Also, I would like a blacklist/whitelist of sites where location should be spoofed/not spoofed.

It works. All it does is run a bit of JavaScript code. It works perfectly fine on most pages, but I've noticed that some (such as Google) will report a location within a couple kilometers from the location coordinates I've entered.

Does what it says. Use latlong.net or whatever to get an accurate coordinate of your favorite location.

It works alright