Setting: URLM_SHORT_CMDS (boolean, default: on)

Whether or not to bind short command names, such as /ff as an alias
for /urlm_open_ff. The only commands that get short-name aliases are
/urlm_open (alias /uo) and the /urlm_open_* commands (which get the
browser tags as their short aliases).

When this option is off, every command defined by urlmanager begins
with the string "urlm_", which acts as a sort of a namespace. Some
people might hate "polluting" the rest of the command namespace, or
maybe they already have a /uo command defined in another script. If
you're one of these people, /set urlm_short_cmds off.