select or open new tab with Ctrl-T

The default config will display all open tabs in dmenu. You can either select
one of them, or if you enter a string, that does not start with „0x“, tabbed
will open a new tab and run the command specified at tabbed-startup but append
the entered string to the command first.

With
tabbed -r 2 surf -e ''
you can hit Ctrl-T and either select an already opened tab or enter an URL,
which will be opened in a new tab with surf.