You are probably free to FIRE, but it depends on how comfortable you are with risk and how much play you have in your budget. If you've built a bare-bones FIRE number and are working in a job that it would be hard to replace once you are out of it a few years, I'd personally be uncomfortable FIREing in that situation. OTOH, if your FIRE budget includes some extras that you can temporarily and happily go without, and/or you're willing/able to do some part-time work here or there to make up any slack, then why not?
FWIW we're doing a combination of the cash cushion others have mentioned and flexible expenses, as we do not have jobs that would be at all easy to return to. I will have 2-3 years' expenses in cash/CDs/individual bonds that we will replenish except when the market is down, so we have time to ride out normal recessions. In addition, our FIRE plan focuses on travel, so if the market goes in the shitter for an extended period of time, we'll just cut back the number of trips and/or spend that time in places with a much cheaper COL (and save London/NYC/Tokyo for when times are rocking!). That combination gives me the confidence that I will be able to adjust to economic issues while still enjoying the activities and quality of life I'm looking forward to.
Sounds like you're happy in your job, so really, there's no harm in letting things ride now to buy yourself a little more flexibility in the future. But congrats on being there!