Hello, Firefox is just a web browser - it can't help you tracking the device. please try it with a purpose-built app like "androidlost" instead or also see https://www.google.com/android/devicemanager...

I know is a web browser and I know it has Ip address records for every user of its utilities, because I was motified by my email account provider that the browser was updated or used by this missing device 3 days ago. All I want to know is the new ip address associated with this missing device, if you need the device code I can make it available. Thanks.

firefox or mozilla does not collect the ip addresses of its users or their devices...

Did you set up Firefox Sync on the device? If so, maybe there is something you can sync over to it that would help in some way. I'm not aware of any tools like that, but wouldn't be surprised if someone has created one.

If the tablet is still connected to your Google account, you may be able to install software on it remotely by "buying" it in the Play store from your PC.

A forum like the following might be able to help with that: http://forums.androidcentral.com/