A certificate is not a creative work. It is a strictly codified representation of a piece of information. Copyright does not apply.
In some jurisdictions, there is a form of copyright for databases, i.e. collections of items which on their own may not be (and usually are not) subject to copyright. This is sometimes known as database right.
In US law, database right is distinct from copyright, and databases are not legally protected — anyone can copy them. In the EU, databases are legally protected.
At the European Union level, the database directive declares that collections that are an “intellectual creation” where the author made a selection are protected by copyright (but with somewhat different rules for the European equivalent of fair use). Mozilla's list of CA certificates falls under this category. Databases that aim to be complete are protected by a distinct database right.
Thus you can legally ignore any licensing terms if you obtain the Mozilla CA certificate database in a US jurisdiction. If you obtain it in an EU jurisdiction, Mozilla is entitled to prevent you from redistributing the database. They could restrict who had access to the database by not allowing everybody on the Internet to download it, if they so wanted. Since the database is provided with a license notice, if you download it, you are entitled to deal with the database only in ways that are allowed by this license. In other jurisdictions, consult the applicable laws.