[FIXED] Firefox starts with message "failed to read the configuration file"

[specs]

After installing Armbian_23.2.1_Rock-5b_bookworm_legacy_5.10.160_xfce_desktop.img I found a nagging error each start of Firefox.

"Failed to read the configuration file. Please contact your system administrator."

 

Looking at internet with Google I found hardly any link referring to linux or armbian, therefore I still don't know which configuration file was actually missing or damaged.

The only link I found with armbian in it contained some very obscure editting of some configuration files (just like many proposed Windows solutions).

 

The issue: where does it go wrong?

The problem is some configuration clutter somewhere in /usr/lib/firefox-esr.

And how to solve?

A Windows video showed a user removing and reinstalling firefox. Reinstalling with a blank configuration really does solve this problem (try as root or use  sudo):
 

apt --purge remove firefox-esr

rm -rf /usr/lib/firefox-esr

apt install firefox-esr

 

I guess only users who don't use a minimal image may encounter this problem.

[ning]

this msg due to leftover file of armbian packages.

[specs]

Just saw the "mark as solution" tab.

Basically when posted this issue was already solved. If it is not against policy I do like to post if only to document.