good

android options:
moz-extension://1a5a64a8-da54-4b41-8b1a-a6781fa54e13/options.html

desktop options:
moz-extension://9b21ad35-a3fe-4966-aef2-216d78c1c069/options.html

Works perfectly though it's not pinnable to the toolbar (FIX THIS!!!),. so getting through the multiple layers of settings to actually change things is a bitch. Go to manage extensions, then options then "use fixed location" to nail a location down.

Thanks to the author.

Th extension does what it says, use the 'Fixed Location' option if high precision location is not important for you. Read the FAQ. It does not change IP Location though, only Broswer Gelocation is changed (even without using GPS).

The extension is working perfectly what I wanted.

It works just fine, also lets you to set any location you want. Quite easy to use (if you know how to read) as well :)