Unfortunately, at this point I am just too comfortable with Chrome's inspector. It might seem like a small thing, but I have a dozen other 'small things' to familiarise myself with every day, so reacquainting myself with Firebug is likely to never become a priority. At this stage it'll take something stupid on Chrome's behalf to encourage me to make a move.
Having said that, I might start using FF as my non-work browser again.
Took me a bit to switch from Firebug to Chrome's inspector when Chrome became better a number of years ago.
Took me not as much to switch back.
You can do it. It just takes some getting used to and perhaps a few compromises until the next updates are released, but it'll encourage Google to actually play nice with the web again.
Having said that, I might start using FF as my non-work browser again.