Active1w ago

Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)

Mozilla·📍 France

Employment

Full-Time

Work mode

Remote

Experience

SENIOR LEVEL

Salary

Not disclosed

Salary not disclosed

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Role overview

Job description

The role 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. Required qualifications Substantial experience in a browser-engine codebase or in automating for a browser-engine, ideally Firefox/Gecko. Solid Javascript and applying that language skill to write automated tests. Profi

…

About this listing

Source: Mozilla's official careers site (via Greenhouse) · last confirmed on the source 29 Oct 2026
Posted 20 Oct 2026

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Role market pulse

How Software Engineer demand looks in France

73/100 · rising

Live jobs

Posted 30d

30d movement

+250%

Remote share

45%

Salary listed

65%

Salary trend 1Y

Not enough history

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What they are looking for

Skills & requirements

javascript →c++ →

Department · Firefox

Hiring company

Mozilla

Technology

The independent browser that has your back. Firefox blocks trackers, has a free built-in VPN, puts you in control of AI, and never sells your personal data.

Company profile →Open jobs →Company site ↗

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