Omarchy: Replacing Chromium
Chromium ships with Omarchy, but it is not the browser I want to live in day-to-day. Swapping it for Firefox is the first thing on my list.
Replace Chromium with Firefox

Type the commands below to replace the bundled Omarchy Chromium build with Firefox and install Lynx along the way.
sudo pacman -Rns omarchy-chromium
rm -rf ~/.config/chromium ~/.cache/chromium
sudo pacman -S --needed firefox lynx
xdg-settings set default-web-browser firefox.desktop
xdg-mime default firefox.desktop x-scheme-handler/http
xdg-mime default firefox.desktop x-scheme-handler/https
xdg-mime default firefox.desktop text/html
Why Firefox?
Firefox is still the default browser on a lot of Linux desktops because it is fully open source and respects user privacy without leaning on the Google ecosystem. I've always used it, and once I sign in, Firefox Sync drops my bookmarks and extensions right back onto the machine.
And Lynx?
Lynx is the classic text-mode browser for people who live in the terminal, like me. It is perfect for quick documentation checks over SSH or when I want to keep distractions out of the way.
After install
Launch Firefox, log into your Firefox account, and within minutes the browser looks like every other machine where you use Firefox. Omarchy starts feeling a little bit more like home.