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Firefox gives me a prompt like [1] on every site that uses HTML5 Geolocation APIs. My iPhone and Windows Phone do the same.

[1] http://dl.dropbox.com/u/9061771/Screenshots/yebr_5sj_2ik.png

so do chrome and safari

And Opera and probably any other browser supporting geolocation.

except for the browsers that have been instructed to never make the info available.

I just tried with geolocation on my phone, and off in my browser, and it worked perfectly.

I tend to pick and choose on an app-by-app basis.

With an IP address(I doubt most people surf with TOR all the time), system time(Comparing time-zone data), language settings, and the myriad of other data given away a person can get ~close enough~. Even then, if you don't want to use the app don't allow it to send/recieve GeoData easy enough.

Same here, I tend to stay away from geolocation as often as possible (obvious exception is google maps on my phone)