1. How do I make a boot disk?
If you are using fedora you should able to do that from the installation cds..nice gui
if you can't find that I will lead you here
http://www.tldp.org/HOWTO/Bootdisk-HOWTO/
2. How can I grant write permission on my windows partition?
open up /etc/fstab with your favorite text editor and add the following to the line where you see /mnt/win (should be in second collumn)
in the 4th collumn "user,umask=000"
3. Can I have Mozilla use the same profile under Windows and Linux?
I don't believe so. Mozilla in linux by default keeps profiles in /home/user/.mozilla
I think it can be changed but, There also may be some differences between the data storage in linux and windows.