FF is on my to do list. I've just finished up a two month project that kept me away from my home office. Now that I am back, my to do list is longer than my arm. Plus I am a creature of habit and have a difficult time approaching changes such as learning a new browser.
I've heard many good things about it though!
As a precaution -- and this may be VERY old school, but it works. I copied all the code directly into a word document where I can simply copy and paste it into the Theme Editor. I date each copy that I save.
Until I figure out another way errr should I say make the time to learn another way, so long as it won't cause problems with my site, I'm happy for now.
1 big project down -- 200 more to go.