Internships 2027 @ Mozilla Firefox
Thank you for visiting us at the 2026 Fall YNCN Career Fair.
Explore exciting opportunities for University of Toronto students to work at the Mozilla office in Toronto. Discover open roles where you can innovate, learn, and grow with us.
Start your journey to make a difference in the tech world today!
Come shape the web with us for hundreds of millions of users everyday!
Firefox Performance Tools team
Make the web faster by improving test automation and profiling tools, creating visualizations, and benchmarking Firefox against other browsers.
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Firefox Graphics team
Develop web standards-compliant CSS and page layout features, with a focus on Asynchronous Pan and Zoom (APZ) keeping scrolling and touch interactions smooth.
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Firefox Engineering Effectiveness team
Use AI and machine learning to make Firefox development workflows faster, higher quality and more reliable.
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Firefox Privacy team
Build defenses against invasive ads and web fingerprinting, making privacy protection a core part of Firefox.
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Firefox Platform DOM team
Build technologies that improve how websites function across the web across Service Workers, Web Workers, and storage APIs.
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Firefox Desktop Integrations team
Build installers, background updates, profile and data migration, and operating system integration across Windows, macOS, and Linux.
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Firefox Localization team
Make Firefox for people around the world for their own languages with Pontoon, our translation platform built with Django and React, and language technologies like Fluent and MessageFormat 2.
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Firefox Search team
Build search features and make the address bar faster and easier to use. Work across the stack with technologies including JavaScript, HTML, CSS, SQL, and Rust.
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Firefox Credential Management team
Make it easier for people to save, manage and autofill passwords, payment methods, and addresses in Firefox.
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Firefox Android team
Design features in Kotlin code to build and improve Firefox on Android mobile devices. A recent intern built support for viewing saved web pages offline.
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Firefox iOS team
Build features and create smooth Firefox experiences on iOS devices. Working primarily in Swift with UIKit and SwiftUI, help improve browsing, tabs, search and privacy features.
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Firefox AI/ML team (Masters student only)
Build in-house AI enhancements for Firefox Smart window ensuring Firefox agentic browsing is useful, robust and smooth, all while providing user choice and control.
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