Does ChatZilla have command completion?
Yes. It works just like nickname completion. If the cursor is in the first word of the text, and the first character is a forward slash (“/”), then ChatZilla will automatically match against commands, instead of users or channels. Tip: You don’t actually need to type the entire command name – ChatZilla will allow you to shorten the command just enough to make the name unique. Warning: Some servers and websites suggest you use /cs instead of /msg ChanServ. Please note that this does not work in ChatZilla versions before 0.9.79, because they support the /css command which ChatZilla matches (since /cs is not a standard IRC command). In ChatZilla 0.9.79, the /css command was removed, as it was just an alias for /motif.