About The Team And Role

Mozilla's Web Conferencing team owns the media capture and sharing features that make Firefox work for video calls: screen, window, and tab capture, and the interface users interact with when they share content in Google Meet, Zoom, or Jitsi.

We're bringing a set of screensharing improvements to Firefox. The backend work is complete and the UX has been designed and approved. We're looking for a front-end engineer on a fixed-term contract to implement it and ship it.

What You'll Do

- Implement approved UX designs for Firefox's screen, window, and tab sharing experience, and see them through to release

- Build browser UI that holds up in a large, widely used codebase: tested, accessible, and localizable

- Work with UX on the cases a design didn't anticipate, and with QA on validating the result

- Support partner testing against major web conferencing services

- Land your work in mozilla-central through public code review on Phabricator

What You'll Bring

- 4+ years building production user interfaces with JavaScript, HTML, and CSS

- Experience implementing an approved design faithfully,



plus the judgment to flag it when the design meets a case it didn't anticipate

- Ability to get productive quickly in a large, mature codebase you didn't write

- Experience writing automated tests for user interfaces

- Strong asynchronous written communication, since the team is distributed across timezones

- Comfort working in public, since Bugzilla and Phabricator are open

Bonus Qualifications

- Prior contributions to Firefox or another open-source browser

- Familiarity with Firefox front-end architecture: browser/, custom elements, XUL, Fluent localization

- Experience with WebRTC or getDisplayMedia

- Accessibility experience with modal dialogs and list navigation

- Experience with Mozilla's test frameworks (browser-chrome, mochitest)

- Experience using AI tooling effectively in front-end development

- Open source setting experience

Hiring Ranges

Canada Tier 1 Locations

$145,000—$170,800 CAD

Canada Tier 2 Locations

$154,000—$168,000 USD

📌 Contract Staff Front End Engineer (Web Conference/Screen Sharing) (Toronto)
🏢 Mozilla
📍 Toronto