Mozilla is hiring a Staff Site Reliability Engineer to design, build, deploy, and operate tools and systems that support Firefox engineering. The role covers developer tooling, CI/CD, workflow automation, cloud infrastructure (including infrastructure as code such as Terraform), observability, and AI-assisted development tools. This is a remote position for Canada with listed Canadian salary ranges.

Join Firefox Enterprise as a Staff Product Manager to own a major 2027 workstream—leading strategy, requirements, success metrics and delivery of a hosted offering alongside on-premise solutions. Work cross-functionally with engineering, design, security, legal, sales and pilot customers; contribute to packaging, pricing, compliance (data residency, GDPR/NIS2/DORA) and go-to-market readiness. Requires 5+ years product management experience, including taking enterprise security or infrastructure products from definition through launch and strong English communication skills.

Mozilla seeks a Staff Product Manager to own a major Firefox Enterprise workstream in 2027, focusing on a hosted offering alongside on‑premise solutions. Responsibilities include defining requirements and success metrics, working with engineering, design, security, legal, sales and pilot customers, and contributing to cross-workstream roadmaps. Requires 5+ years product management experience, including 0-to-1 enterprise security or infrastructure products and experience with hosted/SaaS security products. Strong English communication and experience with compliance and enterprise customers expected.

Build and manage relationships with technology, cloud, public-sector, integration, and service partners in France; identify and qualify new partners; create joint partner plans and commercial models; negotiate partner agreements; generate partner-led revenue through co-selling and reseller activities; plan joint marketing and track partner pipeline and results. Role requires experience in partnerships/business development, ability to build business cases, technical understanding of enterprise software integrations, native-level French and advanced English, and willingness to travel across France and occasionally work with U.S. time zones.

Mozilla is hiring a Strategic Partnerships Manager (or Senior Strategic Partnerships Manager depending on experience) to develop the Firefox Enterprise partner ecosystem in France. The role includes partner identification and qualification, creating joint plans and commercial models, negotiating agreements, driving partner-led revenue through co-selling and reseller activities, and tracking partner pipeline. Native-level French and advanced English are required; the role is remote in France with some travel across the country.

Lead development of the Firefox Enterprise partner ecosystem in DACH by identifying, qualifying, and onboarding technology, cloud, public-sector, and systems-integration partners. Create joint plans, negotiate partner agreements and commercial models, develop business cases, drive partner-led revenue via co-selling and reseller activities, plan joint marketing, and track partner pipeline and results. Position requires experience in partnerships/business development, ability to work with technical stakeholders, native German and advanced English, and willingness to travel across DACH.

Mozilla seeks a Strategic Partnerships / Partnership Lead for Firefox Enterprise (DACH) to identify, qualify and manage technology, cloud, public-sector and systems-integration partners across Germany, Austria and Switzerland. Responsibilities include partner mapping, joint planning, negotiating agreements, building business cases and generating partner-led revenue through co-selling and reseller activities. Requires experience in strategic partnerships or channel/business development, native-level German and advanced English. Hiring range listed as €74,000–€99,000 (EUR, annual).

Mozilla seeks a contract software engineer to develop and improve the WebCompat team's internal tooling: triage/reporting dashboards and the broken-site-report screenshot capture/pipeline. Role requires web development (JavaScript, HTML, CSS), backend work with Python and Django, comfort with automation and web services, and collaboration with QA.

Work on the Firefox DOM Core team to write Web Platform Tests and Gecko mochitests, fix failing tests and bugs, and collaborate via code review to improve Session History correctness in Gecko. Requires substantial browser-engine or automation experience (ideally Firefox/Gecko), strong C++ and JavaScript skills, and debugging experience in large codebases.

Work on the Firefox DOM Core team to write Web Platform Tests and Gecko mochitests, fix issues to pass tests, and iterate through code review to improve Session History test coverage and Gecko correctness. Requires substantial browser-engine or automation experience, strong C++ and JavaScript skills, and debugging in large codebases.

Work on the Firefox DOM Core team to write Web Platform Tests and Gecko mochitests, fix issues to improve Gecko correctness, and collaborate via public bugs and code review. Requires substantial experience with browser-engine codebases (ideally Firefox/Gecko), strong C++ and JavaScript skills, and debugging expertise in large codebases.

Work on implementing Storage Encryption Everywhere in Gecko: migrating data/schemas, implementing data storage in PBM, writing Web Platform Tests and Gecko tests, iterating through public code review, and shepherding the feature through Nightly, Beta, and Release. Requires strong C++, browser-engine experience (ideally Firefox/Gecko), database experience, multithreaded debugging and performance optimization skills.

Reduce Firefox's WebCompat bug backlog by finishing or verifying diagnoses of long-tail site-breakage bugs, writing interventions or simple (often AI-assisted) fixes, and reproducing and triaging incoming reports. Requires HTML, CSS, JavaScript, browser devtools proficiency and cross-browser diagnosis; Gecko and WebCompat/web-standards experience preferred.

Join Mozilla to help reduce Firefox’s WebCompat backlog by finishing or verifying diagnoses of long-tail site-breakage bugs, reproducing and triaging incoming reports, and writing interventions or simple (often AI-assisted) fixes. Preferred knowledge of Gecko and web standards; strong web-development and browser-devtools debugging skills required.

Thunderbird seeks a Senior Manager, Accounting & Finance (Head of Finance) to lead accounting, financial planning & analysis, tax, treasury, and finance operations for a fully remote US role. Responsibilities include overseeing month/annual close, US GAAP reporting, revenue recognition across donations/subscriptions/enterprise arrangements, budgeting/forecasting, tax and VAT/GST, payroll oversight, cash-flow and treasury, audit management, and strengthening systems and controls. Role requires 15+ years of relevant experience, people management, and permanent work authorization to work in the United States. Periodic domestic/international travel may be required.

Hands-on Senior Manager, Accounting & Finance to lead accounting, financial planning & analysis, tax, treasury, and finance operations for Thunderbird. Role reports to the COO, manages a small finance team, requires 15+ years of relevant experience with substantive US GAAP/controllership responsibilities, and involves remote work with required overlap with North American time zones. US salary range provided: $165,000–$190,000 USD/year. No visa sponsorship.

Mozilla seeks a Policy Communications Lead for Europe to translate policy positions into proactive media narratives, build relationships with journalists and policymakers, prepare spokespeople, and work cross-functionally on product and policy communications. Requires 5+ years in policy communications or media relations with strong writing, stakeholder engagement, and issues management experience.

Mozilla seeks a Policy Communications Lead for Europe to drive proactive media narratives on privacy, AI, open source, competition and internet regulation. Responsibilities include media relations, narrative and content development (press releases, op-eds, policy statements), media training, stakeholder engagement, cross-functional collaboration with product/legal/engineering, and crisis communications. Role is remote with a Europe focus; 5–10 years of relevant policy communications or media relations experience is required. French and German are listed as assets.

Join the Firefox Desktop Integrations team to build and maintain OS-level features that increase engagement (notifications, pinning, launch on login, default browser flows). The role involves implementing experiments with feature flags and telemetry, working on platform-specific integration challenges (Windows/macOS), collaborating with product/design/data teams, and contributing to an open-source codebase.

Work on designing, implementing, testing, and shipping security and hardening features for Firefox, improving security architecture (cryptographic protocols, WebPKI, privilege isolation), and diagnosing stability, performance, and memory issues in a complex multithreaded, cross-platform codebase. Requires 3+ years in low-level systems programming with strong C/C++ proficiency, debugging skills, familiarity with web technologies, and interest or experience in Rust.