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Firefox OS Integration Engineer, Mac OS Engineering

United States; Canada · Job Posted January 02, 2026
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Job Description

The OS Integration team ensures Firefox and other Gecko-based products harmonize well with the host operating system and environment. This includes native crash reporting, OS abstraction layers, sandboxing, and hardening. We’re a distributed team with expertise in Windows, macOS, and Linux-based operating systems with this role focusing on macOS. In this role, you will be a member of the OS Integration team specializing in Firefox on macOS. You will primarily work on projects, bug fixes, and enhancements to improve the Firefox user experience on the Mac platform. This will include stability, performance, and security topics as well as implementing support in Firefox for features available on the platform. Projects range from low-level systems programming to user interface components.

Job Responsibility

  • Develop, test, and ship fixes and new features for Firefox on macOS, with a focus on creating a high-quality user experience
  • Work in the open source Mozilla codebase touching a variety of technologies including C, C++, rust, Objective-C, JavaScript, and HTML/CSS
  • Investigate and respond to crash reports and user-submitted bugs to improve the stability and reliability of Firefox for millions of Mac users
  • Grow your expertise while collaborating with a distributed team and participating in technical discussions, planning, code reviews, and problem solving
  • Break down problems into manageable units, seek early feedback, and document your design choices to foster learning and alignment

Requirements

  • A degree in Computer Science or a related field or comparable work experience
  • Demonstrated experience such as a significant project or internship using systems programming languages like C, C++, Objective-C, or Rust
  • Knowledge of web technologies such as Javascript, HTML, and CSS
  • Strong problem-solving and debugging skills
  • Written and verbal communication skills with a collaborative mindset
  • Willingness to work effectively in a distributed team environment
  • Commitment to our values: Welcoming differences
  • Being relationship-minded
  • Practicing responsible participation
  • Having grit

Nice to have

Ideally, but not required, experience in developing applications for macOS with native frameworks like AppKit or Cocoa

What we offer

  • Generous performance-based bonus plans to all eligible employees
  • Rich medical, dental, and vision coverage
  • Generous retirement contributions with 100% immediate vesting
  • Quarterly all-company wellness days
  • 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)
  • Flexible work environment
  • Industry-leading paid parental leave
  • Reimbursement for professional development (up to $3,000/year)
  • A work setup including the latest hardware and software of your choice

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