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Duncan McIntosh

PROFILE

Duncan Mcintosh

Over a three-month period, contributed to mozilla/gecko-dev and mozilla/gcp-ingestion by building and refining features focused on browser UI reliability and backend data processing. Developed the Nimbus Taskbar Tabs Experiment and improved Taskbar Tabs visibility logic using JavaScript and C++, enhancing user experience and privacy on Windows through dynamic feature toggling and per-session download progress tracking. Addressed ABI compatibility for cross-context access and strengthened test robustness with asynchronous programming techniques. In mozilla/gcp-ingestion, delivered a Stub URI Parsing feature for source attribution, updating parsing logic and telemetry to improve data quality and analytics. Work emphasized maintainability, testing, and cross-platform consistency.

Overall Statistics

Feature vs Bugs

57%Features

Repository Contributions

10Total
Bugs
3
Commits
10
Features
4
Lines of code
1,747
Activity Months3

Work History

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 monthly performance summary for mozilla/gcp-ingestion. Delivered a new Stub URI Parsing feature with Launched-by Source Tracking, enabling explicit attribution of how a stub installer was initiated. Updated parsing logic (including SUFFIX_LENGTH map and ParseUri attributes) and refreshed tests to cover the new launched_by parameter. This work improves data quality for attribution, downstream routing, and analytics across deployment pipelines.

July 2025

3 Commits • 2 Features

Jul 1, 2025

July 2025 (2025-07) monthly performance summary for mozilla/gecko-dev. Focused on delivering user-visible feature improvements, enabling ABI-stable cross-context access, and enhancing test reliability to reduce flaky behavior and accelerate iteration. The quarter’s efforts strengthen UX correctness, stability, and maintainability with targeted code cleanups and robust test coverage.

June 2025

6 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary: Focused on strengthening Taskbar Tabs reliability, privacy-aware progress tracking, and feature testing in mozilla/gecko-dev. Delivered the Nimbus Taskbar Tabs Experiment with tests and manifest updates to enable dynamic control via webApps, plus a set of UI/interaction fixes to improve usability and accuracy of tab/window state. Implemented per-browsing-mode separation of the DownloadsTaskbar on Windows to correctly reflect download progress for private vs. public sessions, supported by testing additions. These efforts reduced surface-area for regressions, improved user experience on Windows, and enhanced cross-feature consistency across Taskbar-related UI and downloads, driving measurable business value through fewer bug reports and more predictable behavior for end users.

Activity

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Quality Metrics

Correctness95.0%
Maintainability92.0%
Architecture86.0%
Performance90.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++CSSJavaJavaScriptYAML

Technical Skills

ABIAsynchronous ProgrammingBackend DevelopmentBrowser DevelopmentBrowser Extension DevelopmentBrowser TestingBuild SystemsC++CSSCross-platform DevelopmentData ProcessingFeature TogglingFront End DevelopmentFront-end DevelopmentJavaScript

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

mozilla/gecko-dev

Jun 2025 Jul 2025
2 Months active

Languages Used

C++CSSJavaScriptYAML

Technical Skills

Browser DevelopmentBrowser Extension DevelopmentCSSCross-platform DevelopmentFeature TogglingFront End Development

mozilla/gcp-ingestion

Oct 2025 Oct 2025
1 Month active

Languages Used

Java

Technical Skills

Backend DevelopmentData ProcessingTelemetry