Add Firefox, fix xdg-open

Change-Id: I63fe342f7f4005549876c41c2e9d294ff835d807
Reviewed-on: https://git.clicks.codes/c/Coded/nixConfig/+/94
Reviewed-by: Samuel Shuert <coded@clicks.codes>
Tested-by: Samuel Shuert <coded@clicks.codes>
2 files changed