I'm wondering if there is any value in modifying tab-browser?
Shouldn't we just consider it as low-level API that expose private tab/windows?
And then just start deprecating it (if other low level tabs API are ready to replace all its features!)?

I looked at AMO addons, out of 1197 addons, only 12 are using it.
flattr, fastest_search_instant_browse, copy_shortcut_url, getvega, copy_shortcut_url, terms_of_service_didnt_read, busca_wikipedia_pt, ipim-initial, add_on_builder_helper (!!), triplesync, pageshots_for_german_search_portals, waferthin, samar210_10.
@canuckistani --^