Hit or miss, though I don't think that is the extension's fault. I use a VPN, and that often means that sites display things based on my IP's location, but inappropriate for my actually location. I used the extension to set a fixed location and some sites respect it and others do not. For instance, lowes.com displays the store using the location of my VPN IP address on the other side of the state, and homedepot.com uses the fixed location from the extension. I think you just need to keep in mind that different sites use different techniques to derive your location. In my case, I want the security of a VPN with the convenience of sites knowing roughly, but not exactly, when I am. That does not seem to be 100% possible with this extension, but I'll use it for a while to see if it's good enough.