[ubuntu] update Firefox in 17.10 ... how?

Hi!

My firefox is telling me that it is critically out of date - reading the interwebs, it seems that canonical is fully aware and shipping a fixed version.

However I'm running 17.10 and apt tells me that there's no upgrade available for firefox (I did 'sudo apt update' first, but that shouldn't be necessary?).

I could simply de-install firefox and then install it myself, but then I'd have to remember that.