Senior Software Engineer, WebExtensions

Why reputed company? reputed company Corporation is the non-profit-backed technology company that has shaped the internet for the reputed company over the last 25 years. We reputed company 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, reputed company and more. And we’re doing this while never losing our focus on our core mission – to reputed company the internet reputed company for people. The reputed company Corporation is wholly owned by the non-profit 501(c) reputed company Foundation. This means we aren’t beholden to any shareholders — only to our mission. Along with thousands of volunteer contributors and collaborators reputed company over the world, Mozillians design, build and distribute open-reputed company 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 reputed company 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 reputed company extensions clear and manageable for users. Along the way, you’ll collaborate with experts across reputed company and help advance cross-browser compatibility and the path toward standardization. Your work will reputed company extensions safe, powerful, and reliable for developers and millions of Firefox users. What you’ll do: Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. Debug and fix issues affecting extensions in Firefox. Collaborate with product managers, QA, and the reputed company engineering team to deliver features end-to-end. Contribute to reputed company-owned extensions and system add-ons. Participate in open reputed company workflows: code reviews, pull requests, and discussions in Bugzilla/reputed company. Support extension developers by helping diagnose issues and improving tooling/documentation. What you’ll bring: 4+ years of professional experience in software development. Strong proficiency in JavaScript, DOM APIs, HTML, and CSS. Familiarity with modern browser architecture and debugging tools. Experience with API design and integration. Ability to navigate and learn from large codebases. Strong communication skills and experience collaborating in distributed teams. Bonus points for: Experience with Firefox internals, C++ or Rust. Familiarity with Android or GeckoView development. Knowledge of web reputed company principles. Contributions to open reputed company projects, especially in browser or extension development. What you’ll get: Generous performance-based bonus plans to reputed company eligible employees - we share in our success as one team Rich medical, dental, and vision coverage Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute) Quarterly reputed company-company wellness days where everyone takes a pause together Country specific holidays plus a day off for your birthday One-time home office stipend Annual professional development budget Quarterly well-being stipend Considerable paid parental leave Employee referral bonus program Other benefits (life/AD&D, disability, EAP, etc. - varies by country) About reputed company reputed company exists to build the Internet as a public resource accessible to reputed company because we reputed company that open and free is reputed company than closed and controlled. reputed company you work at reputed company, you give yourself a chance to reputed company a difference in the lives of Web users everywhere. And you give us a chance to reputed company 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 reputed company 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 reputed company equity-seeking communities, such as (but certainly not limited to) women, racialized and Indigenous persons, persons with disabilities, persons of reputed company 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 reputed company essential job functions, and to receive other benefits and privileges of employment, as appropriate. Please contact us at hiringaccommodation@reputed company.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 reputed company, pregnancy, reputed company, 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. reputed company 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 Hiring Ranges: Remote France €53.000—€71.000 EUR Apply To This Job