@nyoom @icedquinn @allison @mischievoustomato small os, a shell and a light graphical interface. not much, vga and ps/2 etc, but hey it's osdev. i've also played around with the kernel and other hobbyist operating systems.
for chrome and firefox it's mostly been warez shit lol, getting video blobs to dump themselves or automating pulling hls steams etc. although for firefox i had this era where i was doing custom patches for a lot of software on my gentoo install and i'd ran firefox and palemoon at the time, so like i'd do some unstable build flags and sometimes have to fix shit to use them, or i would grab old patches for shit or stuff thatd been removed and update them and add back