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The log file is written over every time you re-launch the Mozilla application.moz_log extension will be added to the file name If MOZ_LOG_FILE is not set, then the output will be logged to the console where the application was launched.MOZ_LOG_FILE - Path (with name) to the log file.optional, not recommended (because it makes logging slower and affects your performance) ,sync : Buffering in log writing is disabled that so latest log data can be seen by tailing or copying the log file.required for all timeouts and issues which need to be correlated to an action at a given time of day (as of 3.0b3pre builds) ,timestamp adds a timestamp to all log lines - generally recommended.Example module and loglevel: IMAP:5,timestamp.Example module and loglevel: POP3:5,SMTP:3,timestamp.MOZ_LOG - CASE SENSITIVE module name and log level separated by colon, multiple modules separated by comma, and additional options:.You can set them globally as system environment variables (find instructions for your OS), or as local environment variables in a batch file/script (described below), or just on the command line. There, set the pref to "All" and open the Error Console (Ctrl+Shift+J). SMTP - NOTE! for Thunderbird 91+ SMTP logging is changed and does not use this way of logging.POP3 - NOTE! for Thunderbird 99+ POP3 logging is changed and does not use this way of logging.MsgDB (level 1=opens/closes, level 5 lists open db's on close, number of msg hdrs in use) (before Thunderbird version 59: MSGDB).MsgCopyService (3.3a4 nightly builds starting ).MsgCompose (before Thunderbird version 59: msgcompose).Mailbox (before Thunderbird version 59: MAILBOX).
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LDAP (before Thunderbird version 59: ldap) - NOTE! for Thunderbird 91+ LDAP logging is changed and does not use this way of logging.IMAPOffline (before Thunderbird version 59: IMAPOFFLINE).In bug 1353919 these options have been unified, the old options are in parenthesis: MailNews applications (SeaMonkey/Thunderbird) allow these CASE SENSITIVE modules/protocols in both debug and release builds.