What's Changed

• chore: update plugin defaults and simplify versioning by @juliandescottes in #111
• chore: release v0.9.9 by @juliandescottes in #112

Full Changelog: v0.9.8...v0.9.9

What's Changed

• Plugin cleanup by @juliandescottes in #106
• feature: add marketplace.json and cleanup plugin related files by @juliandescottes in #107
• Plugin skills enhancement by @juliandescottes in #108
• fix: screenshot skill unreliable by @juliandescottes in #109
• chore: bump version to v0.9.8 by @juliandescottes in #110

Full Changelog: v0.9.7...v0.9.8

What's Changed

• Bug 2018268 - fix: migrate script evaluation tools to WebDriver BiDi by @juliandescottes in #98
• Bug 2018268 - feature: expose firefox version number in get_firefox_info by @juliandescottes in #99
• Bug 2046888 - feature: Add --log-file support by @juliandescottes in #96
• chore: update ws to 8.21.0, vitest to 4.1.8 by @westurner in #90
• fix: kill zombie geckodriver when Firefox is closed by @csamu in #86
• Bug 2047607 - fix: allow to set remote.log.level from --pref by @juliandescottes in #101
• Bug 2044655 - Force app.update.disabledForTesting to true when recommended preferences are disabled by @juliandescottes in #102
• Bug 2047657 - feature: add support for debugging logpoints by @juliandescottes in #100
• Bug 2042462 - feature: add profiler tools for Firefox 154+ by @juliandescottes in #103
• Release v0.9.6 by @juliandescottes in #104

New Contributors

• @westurner made their first contribution in #90

Full Changelog: v0.9.5...v0.9.6

Changed

• Bug 2046777 - fix: use about:blank as start url instead of about:home by @juliandescottes in #94

Full Changelog: v0.9.4...v0.9.5

Added

• Support for connecting to Firefox for Android via --android flag

Fixed

• Navigation to moz-extension:// URLs no longer hangs; now uses BiDi navigate
• Geckodriver binary detection on Windows

Added

• New @mozilla/firefox-devtools-mcp-moz npm package with privileged context support enabled by default
• --profile-path now uses a dedicated subfolder to avoid corrupting existing profiles, and warns when reusing a profile that already exists

Fixed

• Profile reuse warnings are now surfaced as MCP errors so AI assistants can see them
• Network debug command now uses statusMin=400 instead of status="failed" to correctly match 4xx/5xx responses
• Docker image now creates the user home directory

Changed

• Package renamed from firefox-devtools-mcp to @mozilla/firefox-devtools-mcp
• License changed to dual MIT OR Apache-2.0
• Reduced emoji usage in MCP log messages

Added

• evaluate_privileged_script now detects const/let/var statements and rejects them with a helpful error message suggesting IIFE workaround
• BiDi console and network events now degrade gracefully when Firefox Remote Agent is not running, instead of crashing
• Comprehensive e2e scenario integration tests covering the full FirefoxClient API
• Unit tests for privileged context state consistency and statement detection
• Testing documentation (docs/testing.md)

Fixed

• Privileged context state not preserved across tool calls: set_firefox_prefs and list_extensions no longer silently revert a privileged context selection
• Session cleanup on connection failure: getFirefox() now closes the failed instance to prevent zombie geckodriver processes and Marionette session locks

Changed

• Breaking: Removed --marionette-host CLI parameter (connect-existing mode now uses localhost only)
• Rewrote connect-existing mode to use Selenium's native --connect-existing feature via ServiceBuilder, replacing the custom GeckodriverHttpDriver HTTP client (~530 lines removed)
• Replaced custom IDriver/IElement/IBiDi interfaces with native WebDriver/WebElement from selenium-webdriver
• Improved error messages for BiDi-dependent features (console/network) to suggest --remote-debugging-port
• Pinned all dependency versions for build reproducibility
• Updated dependencies: @modelcontextprotocol/sdk 1.29.0, tsup 8.5.0, tsx 4.21.0, typescript-eslint 8.58.0

Full Changelog: 0.9.1...0.9.2

What's Changed

Bug Fixes

• Fixed SERVER_VERSION reporting 0.7.1 instead of actual package version — now reads from package.json dynamically
• Fixed connect-existing mode: session cleanup, BiDi support, --marionette-host parameter (#50)
• Fixed lint/type errors from PR #50 merge
• Resolved 11 security vulnerabilities in dependencies (#47)

Improvements

• Removed fragile process.on handlers in test setup that masked real errors and caused MaxListenersExceededWarning
• Added unit tests for connect-existing mode (BiDi, session cleanup, reconnect)

Contributors

• @MayCXC
• @freema

Full Changelog: 0.9.0...0.9.1

What's Changed

New Features

• Content script evaluation — evaluate JS against web pages (--enable-script flag)
• Privileged context support — chrome-privileged context for Firefox internal development (--enable-privileged-context flag)
• WebExtension tools — install, uninstall, and list Firefox extensions
• Firefox restart tool — restart Firefox with new config at runtime (preserves profile path)
• Preferences configuration — read/write Firefox prefs via CLI (--pref name=value) and runtime tools (set_firefox_prefs, get_firefox_prefs)
• Environment variables & output capture — --env and --output-file CLI flags
• WebDriver BiDi commands — direct support for sending BiDi commands
• MOZ_LOG support — Firefox logging integration

Fixes

• Use native --profile arg for reliable profile loading
• Wait for WebSocket ready before sending BiDi commands
• Fix pref tools failing when env var passed via --env
• Handle disconnected Firefox gracefully in restart_firefox
• Don't kill unrelated Firefox processes on test cleanup

Breaking Changes

• Script evaluation and privileged context are now opt-in via --enable-script and --enable-privileged-context flags
• Removed non-English documentation files

Contributors

• @padenot
• @dmose
• @Majdoddin
• @juliandescottes
• @freema

Full Changelog: 0.8.1...0.9.0

What's Changed

Fixes

• Fixed flaky snapshot integration test on Node 22 CI runners (increased Firefox startup timeout from 30s to 60s)
• Upgraded all GitHub Actions from v4 to v5 (checkout, setup-node) and upload-artifact to v7 to resolve Node.js 20 deprecation warnings
• Publish workflow now uses Node.js 22

Full Changelog: 0.8.0...0.8.1