Add the colorTheme.enable option to the Firefox derivatives by
installing the the Firefox Color extension.
This is not enabled by default because writing extension settings
requires manually setting 'extensions.force = true'. [1]
[1]: https://github.com/nix-community/home-manager/pull/6490
Link: https://github.com/danth/stylix/pull/881
Reviewed-by: Daniel Thwaites <danth@danth.me>
Reviewed-by: NAHO <90870942+trueNAHO@users.noreply.github.com>
Tested-by: NAHO <90870942+trueNAHO@users.noreply.github.com>
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