Adds extension permissions as suggested in
https://github.com/nix-community/home-manager/issues/7001.
Adds the 'profiles.<name>.extensions.settings.<name>.permissions' to Firefox
derivatives. If set, this option adds an assertion that fails if an extension
package requests permissions that weren't added to the permissions option. In
order to not require 'profiles.<name>.extensions.force' to be set when only
permissions, but no extension settings were defined, the relevant assertions
were changed. They now check whether any 'extensions.settings.<name>.settings'
was set instead of checking whether 'extensions.settings' was set.
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Co-authored-by: Robert Helgesson <robert@rycee.net>
Co-authored-by: awwpotato <awwpotato@voidq.com>
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