.EXTRA File Extension
File TypeGoogle BreakPad Crash Log Extra File
File format categories include Binary, Text, XML, and Zip. The format of this file type has not been determined.
What is an EXTRA file?
Crash log file created by Google BreakPad, an open source crash reporting tool used by products such as Mozilla Firefox; may be saved to the local file system upon program crash; can be submitted to the software developers to determine the cause of the crash.
EXTRA files created by Mozilla Firefox are saved to the [user]\AppData\Roaming\Mozilla\Firefox\Crash Reports\pending\ directory.
NOTE: EXTRA files are often accompanied by .DUMP files as well.