I believe that in a previous thread, FirefoxOS devs were hopeful that the way the OS is "layered" will make this less painful -- that upgrading Gecko should be

I believe that in a previous thread, FirefoxOS devs were hopeful that the way the OS is "layered" will make this less painful -- that upgrading Gecko should be much easier than upgrading Android versions, because it wouldn't introduce driver issues etc. Updating the underlying kernel would be more arduous.