@canuckistani any thought about removing tab-browser? Do you have up-to-date statistics on module usages?
If we can drop it, I can just trash this pull request and remove the module instead.
But note that except changing the path of the module and adding a deprecation box in document, we haven't added any runtime deprecation warning message.

@Gozala, @erikvold Otherwise, we should just match what is done for other tabs API, what are we doing for require("sdk/tabs").activeTab?