Customizing Firefox Console.log (for My Own Prototype)

I'm coding a (free software) application (the MELT monitor, on GNU/Linux/Debian/x86-64) which embeds its specific web server. See this question for gory details. If interested, lo

Solution 1:

I’m not developing for Firefox and apologies if you’ve already seen this, but I’ve stumbled across this:

• Custom output in the Web Console on MDN, and specifically console API

Seems like something that might answer your needs.