Mozilla Mail mail filter file?

Running 9.2 I have used the GUI message filters substantially and currently have over 100 filters. Some of these filters uncheck themselves and so they are not run the next time a message that matches the filter criteria is received. I am assuming that the details I have entered via the GUI are stored in a text file and I would like to start editing that file directly. I have done some searching through ~/ I have not been able to locate a file that holds the filter information, even in ~/.mozilla. Is my assumption right that I can edit the filters in a text file and if so where/what is this this file called?