Eons Dev Launcher

Eons Dev Launcher is a lightweight browser extension that injects an "Open" button on GitHub, GitLab, and git.infrastructure.tech repository pages. Clicking this button launches the current repository in a workspace environment such as Kasm or Coder.

For Kasm:

https://workspace.infrastructure.tech/#/cast/dev?kasm_url=<CURRENT_REPO_URL>

For Coder:

https://coder.example.com/templates/devcontainer/workspace?param.repo_url=<CURRENT_REPO_URL>

Originally forked from Gitpod's browser extension and rebuilt for cross-platform compatibility (Linux, macOS, Windows) and modern build tooling.

How It Works

The extension injects a lightweight content script that:

1. Detects when you're viewing a supported repository (GitHub, GitLab, or git.infrastructure.tech)

2. Injects an "Open" button near the repo title or toolbar

3. When clicked, it opens one of the following, depending on configuration:

   • Kasm: https://workspace.infrastructure.tech/#/cast/dev?kasm_url=<CURRENT_REPO_URL>
   • Coder: https://coder.example.com/templates/devcontainer/workspace?param.repo_url=<CURRENT_REPO_URL>

Features

• Adds an "Open" button on GitHub, GitLab, and git.infrastructure.tech repositories
• Opens the repo in a dev workspace platform like Kasm or Coder with a single click
• Works seamlessly on Chrome and Firefox
• Lightweight—no tracking, no telemetry, no accounts required
• Fully open-source under the MIT license
• Liquid.js templating support for flexible URL customization with dynamic variables

Customization

You can configure the workspace URL using Liquid.js templating to create dynamic, flexible URLs.

Available Template Variables

• {{repoUrl}} - The full URL of the current repository page
• {{branchName}} - The branch name extracted from the current URL (if viewing a specific branch)

Change the URL Template

1. Open the extension's Options page:

   • Chrome: chrome://extensions → Eons Dev Launcher → Details → Extension options

   

   • Firefox: Right-click the extension icon → Manage Extension → kebab → Preferences

   

2. Enter a custom workspace URL template using Liquid.js syntax:

   Basic Kasm template:

   https://workspace.infrastructure.tech/#/cast/dev?kasm_url={{repoUrl}}
   

   Coder template with branch name (first 20 characters):

   https://coder.example.com/templates/devcontainer/workspace?name={{branchName|slice:0,20}}&param.repo_url={{repoUrl}}
   

   Important: Liquid.js filter syntax requires no spaces around colons and commas in filter arguments.
   Unfortunately, the stored templates are currently encoded, so spaces, quotes, or other invalid characters will cause rendering errors.

   ✅ Correct:

   {{branchName|slice:0,20}}
   

   ❌ Incorrect (will cause errors):

   {{branchName | slice: 0, 20}}
   

   

3. Save changes—the button will now open your custom environment with the rendered template.

Development Setup

1. Clone the repository

git clone https://github.com/eons-dev/dev.workspace.browser.ext.git
cd dev.workspace.browser.ext

2. Install dependencies

pnpm install

3. Build for your target browser

You can build both versions or just one, depending on your needs.

All builds output to the same eons-dev-launcher/ folder.

It is recommended to clean the output folder between builds if switching browsers.

Chrome build

pnpm run build:chrome

Firefox build

pnpm run build:firefox

The Firefox build automatically injects the required "browser_specific_settings" → gecko.id block for AMO signing and installs.

Loading the Extension (Development Mode)

Chrome / Chromium / Edge

1. Open chrome://extensions
2. Enable Developer mode (toggle in the top-right corner)
3. Click Load unpacked
4. Select the eons-dev-launcher/ folder
5. The "Eons Dev Launcher" icon will appear in your toolbar.

Firefox

1. Open about:debugging#/runtime/this-firefox
2. Click Load Temporary Add-on
3. Select the manifest.json inside the eons-dev-launcher/ folder
4. The extension will appear in your toolbar for this session.

Note: Temporary add-ons are removed when Firefox restarts.

License

MIT © Eons LLC