MetaMask/metamask-extension
Mar 2025 – Feb 2026
12 Months active
Languages Used
JavaScriptHTMLMarkdownShellTypeScriptYAMLSCSSbash
Technical Skills
Browser APIsExtension DevelopmentJavaScriptBackend DevelopmentCryptographyDependency Management
Mark Stacey
PROFILE
Mark Stacey
Mark Stacey contributed to the MetaMask/metamask-extension repository, delivering 52 features and 18 bug fixes over 12 months focused on stability, security, and maintainability. He engineered improvements across onboarding flows, controller logic, and build pipelines, using JavaScript, TypeScript, and Node.js. Mark refactored onboarding UI detection to prevent race conditions, optimized disk I/O in controllers, and enhanced error reporting with Sentry integration. He streamlined CI/CD workflows, hardened dependency management, and improved end-to-end testing reliability. His work included codebase cleanup, security patching, and documentation updates, resulting in a more robust extension architecture and smoother user experience across browsers and environments.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
139Total
Bugs
18
Commits
139
Features
52
Lines of code
38,631
Activity Months12
Your Network
231 peopleWork History
February 2026
20 Commits • 2 Features
Feb 1, 2026February 2026: Stabilized the MetaMask extension across Chromium updates and bolstered engineering efficiency. Implemented crash-stability safeguards, hardened CI/build pipelines, and compatibility workarounds to maintain Storybook integrations, while cleaning up the codebase for better maintainability and error visibility. These efforts improved user experience, reduced release risk, and accelerated development cycles.
20 Commits • 2 Features
Feb 1, 2026February 2026: Stabilized the MetaMask extension across Chromium updates and bolstered engineering efficiency. Implemented crash-stability safeguards, hardened CI/build pipelines, and compatibility workarounds to maintain Storybook integrations, while cleaning up the codebase for better maintainability and error visibility. These efforts improved user experience, reduced release risk, and accelerated development cycles.
February 2026
January 2026
18 Commits • 8 Features
Jan 1, 2026January 2026 performance snapshot for MetaMask/metamask-extension. Focused on security compliance, stability, and code health while streamlining maintenance. Delivered a critical dependency advisory fix, strengthened UI/controller reliability, improved test stability, and enhanced QA coverage with new E2E testing and build hygiene.
January 2026
18 Commits • 8 Features
Jan 1, 2026January 2026 performance snapshot for MetaMask/metamask-extension. Focused on security compliance, stability, and code health while streamlining maintenance. Delivered a critical dependency advisory fix, strengthened UI/controller reliability, improved test stability, and enhanced QA coverage with new E2E testing and build hygiene.
December 2025
13 Commits • 4 Features
Dec 1, 2025December 2025 focused on stability, reliability, and security improvements for metamask-extension. Delivered longer UI-to-background RPC timeout to reduce crashes on slower devices, clarified timeout error messaging, implemented PAT-based releases and scoped tokens for PR comments to strengthen CI/CD security, and performed internal maintenance and tooling improvements to streamline development and code quality.
13 Commits • 4 Features
Dec 1, 2025December 2025 focused on stability, reliability, and security improvements for metamask-extension. Delivered longer UI-to-background RPC timeout to reduce crashes on slower devices, clarified timeout error messaging, implemented PAT-based releases and scoped tokens for PR comments to strengthen CI/CD security, and performed internal maintenance and tooling improvements to streamline development and code quality.
December 2025
November 2025
10 Commits • 2 Features
Nov 1, 2025November 2025 highlights: Delivered key features to stabilize and extend E2E testing, improved security posture, and refined error handling for faster issue resolution. Achieved production-like test workflows, reduced test flakiness, and cleaned up MV3 manifest warnings. These efforts increased release confidence, reduced operational risk, and demonstrated strong technical execution across testing, security, and performance hygiene.
November 2025
10 Commits • 2 Features
Nov 1, 2025November 2025 highlights: Delivered key features to stabilize and extend E2E testing, improved security posture, and refined error handling for faster issue resolution. Achieved production-like test workflows, reduced test flakiness, and cleaned up MV3 manifest warnings. These efforts increased release confidence, reduced operational risk, and demonstrated strong technical execution across testing, security, and performance hygiene.
October 2025
9 Commits • 4 Features
Oct 1, 2025October 2025 monthly summary for MetaMask extension development. Focused on stabilizing user preferences state, improving network onboarding and build pipelines for experimental features, upgrading security and compatibility tooling, and refactoring core controllers to reduce maintenance burden. The work enhances user experience consistency, build reliability, and provides a solid foundation for upcoming feature work.
9 Commits • 4 Features
Oct 1, 2025October 2025 monthly summary for MetaMask extension development. Focused on stabilizing user preferences state, improving network onboarding and build pipelines for experimental features, upgrading security and compatibility tooling, and refactoring core controllers to reduce maintenance burden. The work enhances user experience consistency, build reliability, and provides a solid foundation for upcoming feature work.
October 2025
September 2025
21 Commits • 10 Features
Sep 1, 2025September 2025: Delivered a revamped controller metadata framework and state wiring across the metamask-extension, reinforced with dependency hardening and improved test practices. This work reduces operational risk, accelerates feature delivery, and improves maintainability across core controllers.
September 2025
21 Commits • 10 Features
Sep 1, 2025September 2025: Delivered a revamped controller metadata framework and state wiring across the metamask-extension, reinforced with dependency hardening and improved test practices. This work reduces operational risk, accelerates feature delivery, and improves maintainability across core controllers.
August 2025
11 Commits • 3 Features
Aug 1, 2025Monthly performance summary for 2025-08 focused on reliability, build stability, and test confidence for the metamask-extension. Key outcomes include: consolidated Sentry initialization into a shared utility and dedicated init script to improve reliability and reduce bundle size; ensured development DSN is correctly configured across Firefox builds through LavaMoat policy alignment; synchronized build workflow by aligning OAuth IDs and QuickNode URLs in the bundle script, removing extraneous environment variables, and pruning obsolete policy overrides to improve consistency; enhanced E2E testing reliability and performance via fixes to fixtures, faster server shutdown, improved E2E driver, a handshake timeout for unresponsive background connections, and enabling parallel shutdown, with updated test utilities documentation; fixed a misleading console warning by correcting the policy override identifier for @ethersproject/random, reducing startup noise for wallets. Overall impact: more stable releases, faster feedback loops, lower maintenance cost, and higher confidence in cross-browser behavior. Technologies/skills demonstrated include JavaScript/TypeScript, build tooling optimization, Sentry integration, LavaMoat policy alignment, E2E automation, and test infrastructure improvements.
11 Commits • 3 Features
Aug 1, 2025Monthly performance summary for 2025-08 focused on reliability, build stability, and test confidence for the metamask-extension. Key outcomes include: consolidated Sentry initialization into a shared utility and dedicated init script to improve reliability and reduce bundle size; ensured development DSN is correctly configured across Firefox builds through LavaMoat policy alignment; synchronized build workflow by aligning OAuth IDs and QuickNode URLs in the bundle script, removing extraneous environment variables, and pruning obsolete policy overrides to improve consistency; enhanced E2E testing reliability and performance via fixes to fixtures, faster server shutdown, improved E2E driver, a handshake timeout for unresponsive background connections, and enabling parallel shutdown, with updated test utilities documentation; fixed a misleading console warning by correcting the policy override identifier for @ethersproject/random, reducing startup noise for wallets. Overall impact: more stable releases, faster feedback loops, lower maintenance cost, and higher confidence in cross-browser behavior. Technologies/skills demonstrated include JavaScript/TypeScript, build tooling optimization, Sentry integration, LavaMoat policy alignment, E2E automation, and test infrastructure improvements.
August 2025
July 2025
20 Commits • 12 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for metamask-extension focusing on stability, performance, and security improvements across core features and UI flows.
July 2025
20 Commits • 12 Features
Jul 1, 2025July 2025 (2025-07) monthly summary for metamask-extension focusing on stability, performance, and security improvements across core features and UI flows.
June 2025
6 Commits • 4 Features
Jun 1, 2025June 2025: MetaMask extension development focused on release reliability, build clarity, and runtime stability. Key features delivered include: (1) Release Notes Update for version 12.18.3 to ensure accurate changelog and release communication, (2) CI/CD reliability improvement for Crowdin workflow by using a specific PAT so Crowdin commits trigger subsequent workflows and status checks, (3) Build system clarifications documenting that dependencies are transpiled when not browserify-compatible or when language features are unsupported, not solely for lavaMoat compatibility, (4) Client status retrieval enhancement to expose getIsActive via getClientStatusHandler for accurate active-state reporting, and (5) GetSelection-related bug fix to resolve console and scuttling errors across builds, ensuring the Send flow works in production and other builds.
6 Commits • 4 Features
Jun 1, 2025June 2025: MetaMask extension development focused on release reliability, build clarity, and runtime stability. Key features delivered include: (1) Release Notes Update for version 12.18.3 to ensure accurate changelog and release communication, (2) CI/CD reliability improvement for Crowdin workflow by using a specific PAT so Crowdin commits trigger subsequent workflows and status checks, (3) Build system clarifications documenting that dependencies are transpiled when not browserify-compatible or when language features are unsupported, not solely for lavaMoat compatibility, (4) Client status retrieval enhancement to expose getIsActive via getClientStatusHandler for accurate active-state reporting, and (5) GetSelection-related bug fix to resolve console and scuttling errors across builds, ensuring the Send flow works in production and other builds.
June 2025
May 2025
7 Commits • 2 Features
May 1, 2025May 2025 monthly summary for MetaMask extension development focusing on release-note quality, test reliability, and codebase simplification. Key outcomes include updated changelog entries for 12.x releases (including CP-12.18.0), stabilization of end-to-end login tests to reduce flakiness, and removal of MetaMask Institutional (MMI) from build and configs to streamline the codebase and build process. These efforts involved 7 commits across three work areas: changelog updates (4 commits), login test reliability (1 commit), and MMI decommissioning (2 commits). The work improved release readiness, user-facing documentation quality, test stability, and maintainability of the build, delivering business value through clearer release notes, more reliable user flows, and a leaner codebase.
May 2025
7 Commits • 2 Features
May 1, 2025May 2025 monthly summary for MetaMask extension development focusing on release-note quality, test reliability, and codebase simplification. Key outcomes include updated changelog entries for 12.x releases (including CP-12.18.0), stabilization of end-to-end login tests to reduce flakiness, and removal of MetaMask Institutional (MMI) from build and configs to streamline the codebase and build process. These efforts involved 7 commits across three work areas: changelog updates (4 commits), login test reliability (1 commit), and MMI decommissioning (2 commits). The work improved release readiness, user-facing documentation quality, test stability, and maintainability of the build, delivering business value through clearer release notes, more reliable user flows, and a leaner codebase.
April 2025
3 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for the MetaMask metamask-extension repo. Delivered three targeted changes that improve security, interoperability, and user experience, aligned with spec requirements and platform expectations. All work was completed in the MetaMask/metamask-extension repository with direct commits across core code paths.
3 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for the MetaMask metamask-extension repo. Delivered three targeted changes that improve security, interoperability, and user experience, aligned with spec requirements and platform expectations. All work was completed in the MetaMask/metamask-extension repository with direct commits across core code paths.
April 2025
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary focusing on stability of the onboarding/UI startup flow in the MetaMask extension. Delivered a targeted bug fix that prevents the fullscreen onboarding UI from appearing on every browser startup by replacing sessionStorage-based detection with a global variable, ensuring the UI shows only on the initial installation. The change landed as a concise, review-friendly commit in the metamask-extension repository and improves overall startup reliability.
March 2025
1 Commits
Mar 1, 2025March 2025 monthly summary focusing on stability of the onboarding/UI startup flow in the MetaMask extension. Delivered a targeted bug fix that prevents the fullscreen onboarding UI from appearing on every browser startup by replacing sessionStorage-based detection with a global variable, ensuring the UI shows only on the initial installation. The change landed as a concise, review-friendly commit in the metamask-extension repository and improves overall startup reliability.
Activity
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Quality Metrics
Correctness97.4%
Maintainability94.6%
Architecture94.2%
Performance94.0%
AI Usage20.8%
Skills & Technologies
Programming Languages
BashHTMLJSONJavaScriptMarkdownSCSSShellTypeScriptYAMLbash
Technical Skills
API mockingBackend DevelopmentBash scriptingBrowser APIsBrowser CompatibilityBrowser Extension DevelopmentBug FixBuild AutomationBuild ProcessBuild ScriptsBuild System ManagementBuild SystemsBuild ToolsCI/CDChangelog Management
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