List open Firefox tabs from the command line?
The idea would be to access Firefox data from the 'outside'. You might want to look at Stack Overflow question How can I get list of open tabs in Firefox via a command-line application?.
The format in latest versions is JSON compressed with LZ4 + a magic header (mozLz40\0).
This small python script will print tabs: https://gist.github.com/tmonjalo/33c4402b0d35f1233020bf427b5539fa