IT & Software

Web Standards Software Engineer Firefox

Mozilla

Ottawa · Ontario · Canada

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Apply web standards experience and Gecko knowledge to Firefox’s WebCompat backlog, writing interventions and simple fixes with AI assistance.

Mozilla’s Contract Staff Software Engineer assignment focuses on site-breakage bugs affecting real-world web compatibility. You will investigate reported issues, validate diagnoses, and reduce the queue through interventions or landed fixes. The position combines web development with browser-focused triage.

Key Responsibilities:

  • Investigate long-tail WebCompat site-breakage bugs
  • Validate diagnoses before making bugs actionable
  • Create appropriate WebCompat interventions
  • Develop and land simple fixes
  • Use AI assistance during diagnosis and fixing

Requirements:

  • Solid web development using HTML, CSS, and JavaScript
  • Comfort debugging real-world site breakage
  • Fluency with browser developer tools
  • Prior WebCompat or web-standards experience
  • Gecko knowledge or willingness to learn it

Combine web standards, Gecko, and browser debugging expertise to make Firefox site-breakage bugs diagnosed, actionable, or fixed.

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Reference: WJ-4483_1527849 · Posted 08 Nov 2026, 03:08 AM

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