https://developer.mozilla.org.cach3.com/en-US/docs/Mozilla/Firefox_OS/Releases/2.1
Firefox OS 2.1 for developers - Archive of obsolete content | MDN
This section lists various categories of new product features and improvements to existing features.
archive of obsolete contentfirefox osfor developers
https://developer.mozilla.org.cach3.com/en-US/docs/Mozilla/Firefox_OS/Debugging/On-device_console_logging
On-device console logging - Archive of obsolete content | MDN
In addition to being able to log console output and view it using the remote web console, you can log console output into the device's onboard file store, then...
archive of obsolete contentdevice consoleloggingmdn