You have to remove the previous version using Add/Remove progs because the new install will not do it for you. Not because the installer is lazy but because some people might need several Java versions
You're correct, FF is not Mozilla.
I usually use full installer 15Mb from
What i had to do was to copy the following from
into Firefox's plugin folder to make Java work
if you type in address bar in FF about: plugins it will list you all installed plugins
Whether you think that you can, or that you can't, you are usually right.
Help yourself so God can help you..it does exactly what it says on the sig