This is the first change to start moving our settings to a config
approach. These settings are all checkboxes so only checkbox support is
added at this time.
In the future, these settings will be regrouped with other settings in
the Settings Redesign 2025 project. Moving the settings will involve
creating a new config with a different grouping of id/l10n/supportPage
values. It should not require moving any code or markup to move the
settings or convert them to using moz-checkbox rather than XUL checkbox.
Differential Revision: https://phabricator.services.mozilla.com/D240400
efcc38c52b