GrowthBook DevTools

Home of the:

• Chrome DevTools extension that interfaces with the GrowthBook Javascript and React SDKs.
• Visual Editor, used to create and edit variations for visual experiments.

DevTools features:

• View all features and experiments used on the current page
• Override assigned values to test all the different variations
• Override targeting attributes to simulate what different users will see
• Detailed logs explaining exactly why you got assigned a specific value

Build and Release

To build and use this extension locally:

1. Run yarn to install dependencies
2. Run yarn build:chrome or yarn build:firefox to create a new build
3. Chrome, go to chrome://extensions
   • Chrome:
     • Make sure the "Developer Mode" toggle is on
     • Remove any existing GrowthBook devtool extensions
     • Click "Load Unpacked Extension" and select the dist directory
   • Firefox:
     • Similar to Chrome, except you must select any single arbitrary file within the dist directory
4. To enable hot-reloading, run yarn dev which will pick up most changes automatically
5. For changes to certain files (content_script, background), you also need to refresh the extension
   • Chrome: right click the extension icon -> Manage Extension -> refresh button in the top right corner
   • Firefox: right click the extension icon -> Manage Extension -> gear icon -> Debug Add-ons -> reload button

Publishing

Chrome Web Store:

1. Increment the version in public/manifest.chrome.json and package.json (they should be the same)
2. Run yarn package:chrome to create a build.chrome.zip file
3. On the Chrome Web Store Developer Dashboard, go to Packages and upload the build.chrome.zip file
4. Add a changelog entry to the description describing your changes
5. Save the draft and submit for review
6. Make sure to commit and push the changes to GitHub as well

Firefox (addons.mozilla.org):

1. Same as above, but for public/manifest.firefox.json
2. Run yarn package:firefox to create a build.firefox.zip file
3. Upload to addons.mozilla.org
4. Etc...

Developing the Visual Editor

See the Visual Editor CONTRIBUTING doc for more information on how to run the Visual Editor locally and develop it.

Contributing

Some notes

• HTML files go into public/ and are copied by the build into dist/
• TS/TSX files go into src/ and are compiled by the build and put into dist/
• Other assets such as icons, images, and the manifest.json are kept in public/ and also copied into dist/ on build

Changelog

1.2.3 (2025-08-06)

• Bug fixes (experiment tab crashes, experiment rule details not always rendering)

1.2.2 (2025-04-30)

• Support for safe rollouts
• Align back-end interfaces with JS SDK ^1.5.0

1.2.1 (2025-04-16)

• Support for backend SDK debugging (overrides, logs)
• Feature and Experiment views now show both simulated and live evaluations when available
• UI updates
• Bug fixes

1.1.2 (2025-03-25)

• Persist feature and experiment search filter
• Bug fix: Improve association of debug logs to feature rules

1.1.1 (2025-03-17)

• Choose between live, draft, and inactive revisions of features using the GrowthBook API
• Quickly apply feature overrides from feature rules
• Show feature descriptions and other meta information from the API

1.1.0 (2025-03-11)

• Share DevTools session by link
• Import/export DevTools session by JSON blob
• Preview draft features & experiments not in SDK payload
• Bug fixes (occasional attributes tab crashes, mislabeled experiment overrides, theme flickering)

1.0.4 (2025-03-05)

• Ability to clear individual attribute overrides
• Bug fixes (legacy SDK support, prevent attribute caching, search)

1.0.3 (2025-03-03)

• Allow inspecting & overriding features not in the SDK payload (stale or unpublished features)
• Allow overriding feature value types
• Bug fixes (special chars in feature keys, legacy SDK support, type safety)
• Warn when using outdated SDK version

1.0.2 (2025-02-27)

• DevTools + Visual Editor for Firefox
• Bug fixes (persist overrides between page loads, better handling of missing API keys)

1.0.1 (2025-02-24)

• Dark mode
• Log tracking calls in debug logger
• Bug fixes and legacy SDK support

1.0.0 (2025-02-21)

• Brand new DevTools application
• Runs docked or in popup mode (click the extension icon)
• Does not affect Visual Editor

0.4.1 (2024-10-03)

• Fix bugs with selectors and inline editing

0.4.0 (2024-09-26)

• Allow inline editing (contentEditable)
• Fix bugs causing occasional crashes
• Minor UI improvements

0.3.9 (2024-08-20)

• Fix some text entry field bugs
• Fix bug where cursor: move is appended to mutations
• Add pop-up menu
• Bump SDK verison (1.2.0)

0.3.8 (2024-07-08)

• Enforce charset for visual_editor.js
• Bump GB SDK version to latest (1.1.0)

0.3.7 (2024-04-09)

• Optimize global CSS editing
• Allow access in incognito mode
• Display SDK diagnostics in DevTools
• Added documentation

0.3.6 (2024-02-28)

• Updates & bug fixes

0.3.4 (2023-11-21)

• Bug fixes

0.3.3 (2023-11-13)

• Improved drag and drop
• SDK warnings and detection
• DebugPanel
• General UI improvements and bug fixes

0.3.2 (2023-08-28)

• Update dependencies

0.3.1 (2023-08-15)

• Security fixes and performance improvements
• Visual editor - OpenAI copy suggestions (beta)

0.3.0 (2023-06-06)

• Visual editor - ability to inject custom javascript as part of a test
• Visual editor - modify inline CSS properties
• Various bug fixes for visual editor

0.2.2 (2023-05-03)

• Visual editor - ability to re-arrange elements on the page and undo button for innerHTML changes
• Various bug fixes for visual editor

0.2.1 (2023-04-03)

• Bug fixes for visual editor
• Only include visual editor script on pages with the vc-id querystring parameter (fixes conflicts on some websites)

0.2.0 (2023-03-28)

• Integrate the new Visual Editor
• Switch to a custom webpack build process instead of Create React App

0.1.3 (2022-10-17)

• Improve error message when GrowthBook SDK is not detected

0.1.2 (2022-06-08)

• Fix bug: forcing experiment variations in devtools was not updating feature values correctly in the UI

0.1.1 (2022-01-22)

• Support for context.overrides
• UI improvements for boolean feature flags
• Auto-sync devtools when page's GrowthBook instance changes
• Visually show variation weights in an experiment

0.1.0 (2022-01-05)

• Initial release