As far as I understand, any combination thereof: - Mozilla has an (open-source, open-standards-based) market technology, that can be deployed both by Mozilla,

As far as I understand, any combination thereof: - Mozilla has an (open-source, open-standards-based) market technology, that can be deployed both by Mozilla, by operators and by whoever wants to; - any web site could come with the option to install itself as an application, this only requires a few additional files and/or metadata.