I think there's a suggestion for this, but the xenforo tabs are a huge pain and that's why i'm posting it as bug!
Specially because "all" other pages, which i'm visiting daily already support the browserhistory.
members pages, search => you can switch the tabs and use the browserhistory to go back & forward
it's working as expected, (because they're only visual elements)
what's new page, memberprofile you can switch the tabs, but can't use the browserhistory, if you use it, you'll get back to the previous page and not previous tab
not working as expected, can't use the browser back button