Files with fir extension can be usually found as firmware updates for certain models of Canon EOS digital cameras.
There is one other file type using
the FIR file extension!
.fir - FireOne fireworks show file
FIR file extension - Canon Digital Camera EOS firmware
What is fir file? How to open fir files?
File type specification:
File extension fir is mainly used for a special firmware update format for Canon EOS Digital Cameras.
You can import this type of fir files to the EOS camera through USB cable with Canon EOS firmware update utility.