If you like Debian and like to help make it better, and also want to use testing please review this guide where I try to cover many common things and improve your experience:
the domain got me at first, but doku wiki is cool and initial glance looks like some very good effort was put in! will look more later, as i don't have a "perfect" debian setup for personal use and i want to ditch my windows vm.
If you are planning on adding things, my humble suggestion would be how to write a really good bug report, maybe going through how to research what went wrong to narrow down the problem, looking for already filed bug reports, using diff and patch if you have a proposed solution, using reportbug, etc.
Besides Firefox ESR, it came bundled with "Konqueror". Don't know if it depends on your installation's configuration, though. I selected to install "non-free" software, if it helps.
So for me it didn't complain when I uninstalled Firefox ESR, it just set Konqueror as the default web browser