🇬🇧 English | 🇻🇳 Tiếng Việt | 🇯🇵 日本語

GitHub Flex

A cross-browser extension (Chrome & Firefox) that enhances GitHub's interface with productivity features.

Features

• Wide Layout - Expands GitHub to full viewport width
• Table Expand - Expandable tables with persistent state
• Image Lightbox - Click images to view in fullscreen overlay
• GIF Picker - Insert GIFs in comments and issues
• Sidebar Toggle - Hide/show sidebar with button or Alt+M shortcut
• Edit History - Enhanced diff viewer with split/unified/preview modes for comment edits

Installation

Chrome Web Store

Install directly from the Chrome Web Store.

Firefox Add-ons

Install directly from Firefox Add-ons.

From Source

git clone https://github.com/lamngockhuong/github-flex.git
cd github-flex
pnpm install
pnpm build

Then load in your browser:

Chrome:

1. Open chrome://extensions/
2. Enable Developer mode (top right)
3. Click Load unpacked
4. Select the dist/chrome/ folder

Firefox:

1. Open about:debugging#/runtime/this-firefox
2. Click Load Temporary Add-on
3. Select any file in the dist/firefox/ folder

Development

pnpm dev              # Build both browsers with watch mode
pnpm build            # Production build for both browsers
pnpm build:chrome     # Build Chrome only
pnpm build:firefox    # Build Firefox only
pnpm lint             # Check code style
pnpm lint:fix         # Auto-fix issues
pnpm lint:firefox     # Lint Firefox build with web-ext
pnpm test             # Run tests

Publishing to Firefox Add-ons

When submitting a new version to Firefox Add-ons, Mozilla requires source code upload because we use esbuild to bundle. Create the source zip with:

zip -r github-flex-source.zip src/ scripts/ package.json pnpm-lock.yaml biome.json README.md LICENSE manifest.json

Languages

• English (default)
• Vietnamese (Tiếng Việt)
• Japanese (日本語)

The extension automatically displays in the browser's language if supported.

Tech Stack

• Manifest V3 (Chrome 88+, Firefox 112+)
• webextension-polyfill (cross-browser API compatibility)
• Vanilla JavaScript (ES Modules)
• esbuild (bundler)
• Biome (linter/formatter)
• Vitest (testing)

Sponsor

If you find this extension useful, consider supporting its development:

Other Projects

• Termote - Remote control CLI tools (Claude Code, GitHub Copilot, any terminal) from mobile/desktop via PWA

License

MIT