INTERNSHIP DETAILS

Firefox Security Student Worker

CompanyMozilla
LocationGermany
Work ModeRemote
PostedJune 11, 2026
Internship Information
Core Responsibilities
Secure the web browsing experience for millions of users by implementing web security features in Firefox using C++. Improve and automate team processes using Python while collaborating with the open source community.
Internship Type
full time
Company Size
1758
Visa Sponsorship
No
Language
English
Working Hours
40 hours
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About The Company
A lot of companies say they’re “mission-driven.” Our unique corporate structure guarantees that every decision we make upholds our mission: to ensure the internet remains open and accessible. Beholden to neither shareholders nor investors, Mozilla Corporation is wholly owned by the not-for-profit Mozilla Foundation. Along with our communities of 20,000+ contributors and collaborators, Mozilla Corporation’s staff designs, builds, and distributes software that allows people to enjoy the internet on their own terms. Our flagship product — the Firefox browser — has expanded into a family of products that protects users and alerts them of risks, safeguards passwords and provides a secure VPN (with more to come). By maintaining a safe, open internet we're helping humanity, while also helping the individual humans employed here to reach their personal and professional goals. With a relatively small team serving hundreds of millions of people, a culture of exploration, and a commitment to mentorship, opportunities abound to learn and grow at Mozilla.
About the Role

Why Mozilla? 

Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each month, we’re shaping the next 25 years of technology and helping to reclaim an internet built for people, not companies. Our work focuses on diverse areas including AI, social media, security and more. And we’re doing this while never losing our focus on our core mission – to make the internet better for people. 

About this team and role:

The Firefox Application Security Team sits at the center of Firefox security, working on fundamental security projects that span from architecture hardening, over security research to web security. We apply foundational platform improvements as well as automation to scale our work such that it serves all of Firefox and hundreds of millions users world wide.

What you’ll do:
  • Secure the web and the web browsing experience for hundreds of millions of users
  • Get mentorship from seasoned web/security experts
  • Learn and partake in regular team processes that help secure a mature product
  • Improve or automate existing team processes using Python
  • Implement or expand web security features in Firefox using C++
  • Work with the wider open source community
  • Have the possibility to propose and drive your own projects
What you’ll bring
  • Experience in web development and version control systems
  • Experience in programming with Python and practices for secure software development.
  • You speak English fluently and enjoy conducting software engineering work in the open.
  • You are enrolled in a university in Germany and are willing to occasionally visit our office in Berlin
Bonus points for:
  • Experience with C/C++ and familiarity with the concept of memory safety
  • Contributions to open source projects or other group projects
  • Understanding of web security and security APIs, like Content Security Policy or Subresource Integrity.
You will help us to improve the security of Firefox and the web in general. We offer flexible working hours and competitive compensation depending on the number of hours.

About Mozilla

Mozilla exists to build the Internet as a public resource accessible to all because we believe that open and free is better than closed and controlled. When you work at Mozilla, you give yourself a chance to make a difference in the lives of Web users everywhere. And you give us a chance to make a difference in your life every single day. Join us to work on the Web as the platform and help create more opportunity and innovation for everyone online.

Commitment to diversity, equity and inclusion

Mozilla understands that valuing diverse creative practices and forms of knowledge are crucial to and enrich the company’s core mission.  We encourage applications from everyone, including members of all equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of all sexual orientations, gender identities, and expressions.

We will ensure that qualified individuals with disabilities are provided reasonable accommodations to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@mozilla.com to request accommodation.

We are an equal opportunity employer. We do not discriminate on the basis of race (including hairstyle and texture), religion (including religious grooming and dress practices), gender, gender identity, gender expression, color, national origin, pregnancy, ancestry, domestic partner status, disability, sexual orientation, age, genetic predisposition, medical condition, marital status, citizenship status, military or veteran status, or any other basis covered by applicable laws.  Mozilla will not tolerate discrimination or harassment based on any of these characteristics or any other unlawful behavior, conduct, or purpose.

 

Key Skills
Web DevelopmentVersion Control SystemsPythonSecure Software DevelopmentC++Web SecurityOpen Source ContributionMemory Safety
Categories
SoftwareTechnologySecurity & SafetyEngineering
Benefits
Flexible Working HoursCompetitive Compensation