Fuck me dead! I accidentally confused an HTML file for a YAML file and manually opened it in my browser. Unfortunately, I clicked on the OK button of the popped up dialog a bit too fast, it just caught me off guard. It asked which program to open the YAML file in. Of course Firefox thought that it could handle that and suggested itself by default. Conveniently, the “don’t prompt me again and always use this selection from now on” checkbox was enabled.

And then the endless loop of death started. Turns out, this fucking browser can’t do shit with YAML files and delegated to what had been just configured. Oh, would you look at that!? Firefox! Empty tabs after empty tabs appeared. Killing and restarting Firefox just loaded the last session with all the tabs and the loop continued.

Some bloody snakeoil on my work machine slows down link openening requests by two, three seconds. It’s always absolutely anoying, but luckily, it actually limited the rate of new tabs popping up. I still could not close the many tabs fast enough that had accumulated before I noticed what was going on in the background.

Going to the settings to change them was always interrupted with a new tab opening in the foreground.

Finally, killing Firefox and renaming the file on disk before restarting Firefox did the trick and broke the loop. I was still holding down Ctrl+W for a minute or so to get rid of the useless tabs. I didn’t want to loose the important tabs, so just ditching the session wasn’t an option.