Unable to use Facebook Places after manually setting Geolocation in Firefox

I am having a play with Facebook Places but don't want to pu开发者_如何转开发blish my current location for privacy reasons. I therefore changed the geo.wifi.uri in the about:config in Firefox to point to a file containing JSON of my location with the lat and long. This works great and if I test by using Google Maps or the Mozilla Geolocation test I get the location I have specified. However, if I 'Check in' via Facebook (touch.facebook.com) in Firefox I can see the location on the little Bing map but get the following error

We couldn't determine the coordinates of this location. Check if your latitude and longitude are in range, and verify the format of the location.\n

Any ideas?

Thanks

I have wired up Google Latitude to Firefox geolocation. This lets you manually update your location in Google Latitude with a single mouse click, instead of looking up your latitude and longitude yourself and typing it into a local file or URI. My article on the subject is Make Firefox Take Geolocation From Google Latitude.

I am not normally a Facebook Places user, but I browsed over to touch.facebook.com and clicked Places, and was presented with the usual permission prompt and then a list of nearby places. So the problem does not seem to be in Facebook or in Firefox. Without looking at your JSON I could not guess why it's not working.

Cheers, MetaEd