Senior Software Engineer, WebExtensions

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Mozilla

WebsiteLinkedInAll Job Openings

501 - 1000 employees

Founded 1998

👥 B2C

🔒 Cybersecurity

B2C • Cybersecurity • Software

Mozilla is a non-profit organization dedicated to promoting an open and accessible internet. They are the makers of the popular Firefox browser, which emphasizes user privacy, speed, and control. Mozilla also offers a range of products that focus on internet security and privacy, including Mozilla VPN, Firefox Relay, and Mozilla Monitor. Additionally, the organization is involved in open-source projects, AI innovation, and advocating for digital rights. Mozilla aims to empower users with trustworthy technology and policies that protect privacy, support open-source AI development, and foster accountability for tech companies.

📋 Description

• 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 AMO engineering team to deliver features end-to-end. • Contribute to Mozilla-owned extensions and system add-ons. • Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. • Support extension developers by helping diagnose issues and improving tooling/documentation.

🎯 Requirements

• 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 security principles • Contributions to open source projects, especially in browser or extension development

🏖️ Benefits

• Generous performance-based bonus plans to all 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 all-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)