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 easy 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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📌 Web Standards Software Engineer Firefox (Quebec City)
🏢 Mozilla
📍 Quebec City