For example, the bookmarks page url is about:bookmarks. Is there one for the TOR tab as well?
@sync There is no URL for TOR tabs as such. But if you have opened any TOR tabs, you should be able to see Tor at the right corner of the tab.
@gsarvadnya is correct. There is no URL for Tor tabs. Tor tabs are a different type of tab altogether, which behaves differently from other types of tabs with any URL. The starting page is about:newtab no matter what type of tab you’re in.