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Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)
Mozilla
Remote · FranceSalary not disclosedfull-timeMozilla Careers
You will help the Firefox DOM Core team improve the health of the Session History area. You will write tests to improve the coverage; you will fix tests and/or problems to improve the Gecko correctness.
Responsibilities
- Write Web-Platform tests to improve the coverage, and Gecko mochitests as needed
- Fix the problems and pass the tests to improve the Gecko correctness
- Work through code review with the relevant Gecko module owners and iterate to landing
- Definition of done
- Improved Session History test coverage and code correctness in Gecko, measured by passed test cases, allowing the team’s senior engineers to focus on security, performance and strategic projects.
Languages
- Work format
- Remote
- Seniority
- Senior
- Posted
- 20 Oct 2026
- Last verified
- In the last 5 days
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