First off, just FYI, there is a ChromeToPhone firefox addon, and I actually like it better than Chrome's because it allows "send link to phone" in the right-click menu, which comes in very handy if I don't want to actually go to a link or if it's a download link.
These are my main reasons for sticking with Firefox:
1) Firefox Sync (formerly "weave") is what keeps me with Firefox - tabs, history, preferences, bookmarks, passwords (though I use xmarks and lastpass for the latter two). It's awesome being able to go to any computer I own and have the same history, same settings, and accessibility to any tabs I've opened on my other computers. Chrome now has some syncing features, but not near as thorough as Firefox Sync.
2) Faster navigation with keyboard - this one is probably more due to me being used to Firefox, but still, it's an annoyance when I use Chrome. There are two aspects to this one - first, I can hit "ctrl-L" and type "gmail blog" or "hotmail" or "google finance" or "droid forums" and it goes straight to whichever one of those I'm typing, and so far it's 99% accurate. I believe this can be built into Chrome by modifying the default search engine, but haven't figured out how yet. The second aspect to this category is that I can hit "ctrl-L", start typing something, and then simply hit "tab" to navigate through whatever drops down. In Chrome, tab doesn't do that, so I have to move my hand over to the arrow or mouse to select whatever I want that's dropped down. Sounds small, but I don't have to move my hands in Firefox, I do in Chrome.
3) Memory - this one can be debated all day I'm sure, but load up a fresh version of Firefox and a fresh version of Chrome, make sure you have the same addons installed on each, open the same web pages, look in your Windows processes and tell me which uses more memory, total. In my experience, they both get bloated, but Chrome is by no means better in this area.
4) Google - I love that Firefox is simply Firefox and their single goal is to build a great browser. I don't love the fact that Chrome is tied in with Google. It's silly, but my life has enough Google in it with this phone and all other things Google - the last thing I need is a Google influenced browser! This one is by no means a deal killer for me, if Chrome worked out the three above.
5) Compatibility - it's not often, but Firefox is still compatible with more sites and services (like LogMeIn) than Chrome.
What does Chrome have on Firefox, for me anyway? Snappiness - it's definitely snappy, and DOES do a better job of "closing down" memory when tabs are closed than Firefox does. Screen space as well... though I've tweaked Firefox to where it uses less screen space than even Chrome.
This went much longer than I initially intended - sorry about that! I just kept thinking of things.
