Jobs at mozilla
21 open listings. Listed on Arbeitnow (21).
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Contract Staff Software Engineer-Bug Burndown
Firefox
You will help reduce Firefox’s WebCompat bug backlog by finishing or verifying the diagnosis of the long tail of site-breakage bugs, and by writing interventions or simple fixes (often with AI assistance). You turn a large queue of reported breakages into diagnosed, actionable, or fixed bugs…
Listing from Arbeitnow · posted 22 October 2026
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Contract Software Engineer - WebCompat Tooling (Dashboards and Reporting), Firefox
Firefox
The role You will build and improve the WebCompat team’s internal tooling, the dashboards and the broken-site-report screenshot pipeline the team relies on to triage and prioritize site breakage. This is a focused tooling role that makes the WebCompat program faster and more data-driven…
Listing from Arbeitnow · posted 22 October 2026
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Contract Staff Software Engineer - (Firefox) C++,Storage Encryption
Firefox
The role You will help the Firefox DOM LWS team to implement tasks for Storage Encryption everywhere, helping to drive the in-progress project through to completion . Responsibilities Contributing to delivering Storage Encryption Everywhere in Gecko, which may include tasks such as migrating data…
Listing from Arbeitnow · posted 22 October 2026
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Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)
Firefox
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…
Listing from Arbeitnow · posted 22 October 2026
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Contract Sr Data Analyst (SQL,Telemetry,Browser Engine)
Firefox
The Gecko platform is the core engine of our product experience. To maintain competitiveness and user satisfaction, we must move beyond surface-level metrics to understand the deep correlations between engine performance and real-world user behavior. We currently face challenges with data quality…
Listing from Arbeitnow · posted 22 October 2026
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Staff Product Manager – Firefox Enterprise
New Products
Why Mozilla Mozilla Corporation is a non-profit-backed technology company that has helped shape the internet for the better over the past 25 years. We’re the makers of Firefox , the privacy-focused web browser used by more than 225 million people around the world each month. As we look to the…
Listing from Arbeitnow · posted 22 October 2026
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Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)
Firefox
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…
Listing from Arbeitnow · posted 22 October 2026
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Senior Contract C++ / JavaScript Software Engineer Firefox (Browser Engine)
Firefox
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…
Listing from Arbeitnow · posted 22 October 2026
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Contract Sr Data Analyst (SQL,Telemetry,Browser Engine)
Firefox
The Gecko platform is the core engine of our product experience. To maintain competitiveness and user satisfaction, we must move beyond surface-level metrics to understand the deep correlations between engine performance and real-world user behavior. We currently face challenges with data quality…
Listing from Arbeitnow · posted 22 October 2026
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Contract Staff Software Engineer-Bug Burndown
Firefox
You will help reduce Firefox’s WebCompat bug backlog by finishing or verifying the diagnosis of the long tail of site-breakage bugs, and by writing interventions or simple fixes (often with AI assistance). You turn a large queue of reported breakages into diagnosed, actionable, or fixed bugs…
Listing from Arbeitnow · posted 22 October 2026
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Contract Staff Software Engineer - (Firefox) C++,Storage Encryption
Firefox
The role You will help the Firefox DOM LWS team to implement tasks for Storage Encryption everywhere, helping to drive the in-progress project through to completion . Responsibilities Contributing to delivering Storage Encryption Everywhere in Gecko, which may include tasks such as migrating data…
Listing from Arbeitnow · posted 22 October 2026
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Contract Software Engineer - DOM Core Firefox/Gecko
Firefox
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…
Listing from Arbeitnow · posted 16 October 2026
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Senior Security GRC Engineer
Infrastructure
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Software Engineer, Firefox Security
Firefox
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Software Engineer, Firefox Security
Firefox
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Software Engineer, Firefox Security
Firefox
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Security GRC Engineer
Infrastructure
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Security GRC Engineer
Infrastructure
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 16 October 2026
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Senior Software Engineer, Firefox Security
Firefox
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 14 October 2026
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Sr Data Analyst
Firefox
The Gecko platform is the core engine of our product experience. To maintain competitiveness and user satisfaction, we must move beyond surface-level metrics to understand the deep correlations between engine performance and real-world user behavior. We currently face challenges with data quality…
Listing from Arbeitnow · posted 13 October 2026
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Senior Solutions Engineer (DACH), Firefox Enterprise
New Products
Why Mozilla? Mozilla Corporation is the non-profit-backed technology company that has shaped the internet for the better over the last 25 years. We make pioneering brands like Firefox, the privacy-minded web browser. Now, with more than 225 million people around the world using our products each…
Listing from Arbeitnow · posted 11 October 2026
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