Go to Mozilla.org and select to install Firefox.

you did'nt exactly understand my question i want to integrate firefox to my bootable intallation windows xp cd. but by the way thanks for your reply.I solved it by using google

You want to put Firefox on a disk, not the hard drive? Start the FF full installer. When it asks where to put FF (use manual selection), give it the alternate location. But you will need a lot of room for FF.