Wikimedia is a lot like Mozilla. Neither is really hurting for cash.
Say Wikimedia would become dependent on the donations of a company, that company could technically force them to publish misleading information.
In regards to mozilla they are currently not financially independent.
Most of their money comes from google (in exchange google is the default search engine).
Of course, this is not to say that funding the Archive isn't also important.
Yes of course.
But both projects' biggest constraints are not (lack of) funding. It's bad mismanagement, or in the case of Mozilla, really bad mismanagement.