You stopped reading too early. Quoting from the given MDN page:
To log JS errors to disk, set the environment variable "XRE_CONSOLE_LOG" to the path to the filename. i.e. export XRE_CONSOLE_LOG=/path/to/logfile or set XRE_CONSOLE_LOG=C:\path\to\logfile.
If you set it globally it will apply to all applications based on the Mozilla Toolkit, e.g. SeaMonkey, Firefox, Thunderbird, Sunbird, ...
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