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Senior Software Engineer, WebExtensions

May 15, 2026

<div class="gmail_default" style="font-size: small;"> <div> 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. The Mozilla Corporation is wholly owned by the non-profit 501(c) Mozilla Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators all over the world, Mozillians design, build and distribute open-source software that enables people to enjoy the internet on their terms. About this team and role: The WebExtensions platform powers the add-ons ecosystem in Firefox, enabling millions of users to customize their browser while keeping safety and performance at the forefront. As a WebExtensions Engineer, you will help implement new extension capabilities, improve existing APIs, and ensure that extensions remain reliable across Firefox. As a Software Engineer on the WebExtensions team, you’ll bring a passion for exploring complex systems and creating experiences that balance developer power with user trust. You’ll work deep in the Gecko platform to evolve extension capabilities, and you’ll build UI features in Firefox that make extensions clear and manageable for users. Along the way, you’ll collaborate with experts across Mozilla and help advance cross-browser compatibility and the path toward standardization. Your work will keep extensions safe, powerful, and reliable for developers and millions of Firefox users. What you’ll do: <ul> <li style="font-weight: 400;">Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. </li> <li style="font-weight: 400;">Debug and fix issues affecting extensions in Firefox. </li> <li style="font-weight: 400;">Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end. </li> <li style="font-weight: 400;">Contribute to Mozilla-owned extensions and system add-ons. </li> <li style="font-weight: 400;">Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. </li> <li style="font-weight: 400;">Support extension developers by helping diagnose issues and improving tooling/documentation. </li> </ul> What you’ll bring: <ul> <li style="font-weight: 400;">4+ years of professional experience in software development. </li> <li style="font-weight: 400;">Strong proficiency in JavaScript, DOM APIs, HTML, and CSS. </li> <li style="font-weight: 400;">Familiarity with modern browser architecture and debugging tools. </li> <li style="font-weight: 400;">Experience with API design and integration. </li> <li style="font-weight: 400;">Ability to navigate and learn from large codebases. </li> <li style="font-weight: 400;">Strong communication skills and experience collaborating in distributed teams. </li> <li style="font-weight: 400;">Bonus points for: </li> <ul> <li style="font-weight: 400;">Experience with Firefox internals, C++ or Rust. </li> <li style="font-weight: 400;">Familiarity with Android or GeckoView development. </li> <li style="font-weight: 400;">Knowledge of web security principles. </li> <li style="font-weight: 400;">Contributions to open source projects, especially in browser or extension development. </li> </ul> </ul> What you’ll get: <ul> <li style="font-weight: 400;">Generous performance-based bonus plans to all eligible employees - we share in our success as one team</li> <li style="font-weight: 400;">Rich medical, dental, and vision coverage</li> <li style="font-weight: 400;">Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)</li> <li style="font-weight: 400;">Quarterly all-company wellness days where everyone takes a pause together</li> <li style="font-weight: 400;">Country specific holidays plus a day off for your birthday</li> <li style="font-weight: 400;">One-time home office stipend</li> <li style="font-weight: 400;">Annual professional development budget</li> <li style="font-weight: 400;">Quarterly well-being stipend</li> <li style="font-weight: 400;">Considerable paid parental leave</li> <li style="font-weight: 400;">Employee referral bonus program</li> <li style="font-weight: 400;">Other benefits (life/AD&D, disability, EAP, etc. - varies by country)</li> </ul> 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 <a class="external-link" href="mailto:hiringaccommodation@mozilla.com">hiringaccommodation@mozilla.com</a> 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. Group: D #LI-REMOTE Req ID: R3020 </div> </div><div class="content-pay-transparency"><div class="pay-input"><div class="description">Hiring Ranges:</div><div class="title">Remote France</div><div class="pay-range">€53.000—€71.000 EUR</div></div></div>

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Get Hired Faster With COMPANY_NAME!

1: COMPANY_NAME Smart Tools and Direct Employer Connections Help Speed Up Your Hiring Process

2: With Better Matches, Real-time Job Alerts, and Direct Employer Responses, COMPANY_NAME Helps Many Candidates Secure Interviews and Job Offers Within 15 to 30 Days!

3: The Type of Resume You Need to Get Priority Placement

4: Browse Full-Time, Part-Time, and Freelancing Roles With COMPANY_NAME

5: COMPANY_NAME Helps You Grow Your Career

6: The Easiest Way To Find A Job

7: Find Roles That Offer Growth, Culture & Benefits

8: Get Support With Resume, Interviews & Career Planning

9: Your Future Starts Today

10: Get Hired Within 15 to 30 Days With COMPANY_NAME

Senior Software Engineer, WebExtensions

Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

5. HOW DO YOU PROCESS INFORMATION?

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

8. HOW TO PRIORITIZE WORK?

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

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