As I date from Netscape era I much prefer SeaMonkey. However when I did a reasonably default install of Debian 9.8 I got Firefox 60.5.0esr .
Due to *OPERATOR ERROR*, I mangled a preference. On the mozilla.general list I was told to edit pref.js . For SeaMonkey I have no problem. For Firefox where/what is equivalent file/directory? ?? ??? ???? ?????? TIA
