Mozilla is a political organisation. Aside from the fact that developing free, privacy-focused software is an inherently political thing to do, they have the Mozilla Manifesto[0], which states (the relevant bits here being singled out):
> The Internet is a global public resource that must remain open and accessible.
> Individuals’ security and privacy on the Internet are fundamental and must not be treated as optional.
> We will [...] use the Mozilla assets (intellectual property such as copyrights and trademarks, infrastructure, funds, and reputation) to keep the Internet an open platform [and] promote the Mozilla Manifesto principles in public discourse and within the Internet industry.
The Mozilla Foundation regularly leads or joins in political action relevant to its mission. For example we campaigned against SOPA/PIPA and CISPA [1], submitted a Net Neutrality proposal to the U.S. FCC [2], and have testified multiple times to the Librarian of Congress and elsewhere in favor of DMCA exemptions and DMCA reform [3].
> The Internet is a global public resource that must remain open and accessible.
> Individuals’ security and privacy on the Internet are fundamental and must not be treated as optional.
> We will [...] use the Mozilla assets (intellectual property such as copyrights and trademarks, infrastructure, funds, and reputation) to keep the Internet an open platform [and] promote the Mozilla Manifesto principles in public discourse and within the Internet industry.
[0] https://www.mozilla.org/en-US/about/manifesto/details/