The Opportunity

Add-ons (or “browser extensions”) are software programs, most often developed by a third party, that allow you to add features to Firefox to customize your browsing experience. With billions of downloads and millions of users every day, add-ons are a significant part of the Firefox experience.

The Firefox Add-ons team manages the add-ons ecosystem. We drive support for add-ons in Firefox and develop and run On the operations side, we assist add-on developers in creating outstanding products and make sure they are safe to use.

Mozilla is looking for a software engineering student worker to join the Firefox Add-ons team for a twelve-month term, to support our team in improving the platform for users, developers and add-on reviewers.

What You'll Get To Do

  • Join a distributed team to work on a large codebase.
  • Analyze and fix issues reported by users and add-on developers.
  • Improve the add-ons ecosystem experience for developers.
  • Work with software engineers and security experts to help keep add-ons safe for Firefox users.

What You Bring

Minimum Qualifications

  • You have experience with JavaScript and Python in both concept and reading and writing code.
  • You can break complex problems down into actionable steps without losing the big picture.
  • You have an interest in and ability to work with a distributed team, which requires good asynchronous written communication skills as well as good verbal communication skills.
  • You are motivated and eager to learn a lot.

Bonus Points

  • Browser extension experience
  • Security background
  • UX experience

Does this sound like the right twelve-month challenge for you? We'd love to hear from you and make you a part of our team.

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, inclusion, and belonging

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 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.


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