Computer Help

[Tread]

I usually delete index.dat files with CCleaner, but never looked what is written in it or where they are. I use firefox as well, but could only find the index.dat files from internet explorer, windows media player and other Microsoft programs and services.
Did you know where it is? Or does firefox not have it?

Edit:
I don't have to reboot after deleting, is there a way to read the index.dat files, cause I'm not sure if they are deleted.