Mozilla believes that neither @apple nor @google should be able to grant their own browsers exclusive privileges on their respective operating systems. OWA strongly supports this position.
Mozilla believes that browser vendors should have access to certain operating system APIs in order to allow greater browser competition and differentiation (even if those APIs are not being used currently by Safari). The remedy must take careful consideration of security concerns.
We encourage you to read Mozilla’s full response here:
https://assets.publishing.service.gov.uk/media/63e22fa1d3bf7f172f6ce872/Mozilla.pdf