Examine source code of TWIN68

{
  "manifest_version": 2,
  "name": "Workspaces for Firefox",
  "version": "1.1.0",
  "description": "Implements Firefox-wide tab management, inspired by virtual desktops.",
  "browser_action": {
    "default_icon": "icons/palette-32.png",
    "default_title": "Workspace Palette",
    "default_popup": "palette.html",
    "browser_style": true
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "tabs",
    "contextualIdentities",
    "cookies",
    "storage"
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Alt+Space",
        "windows": "Ctrl+Space"
      }
    }
  },
  "background": {
    "scripts": [
      "commons.bundle.js",
      "background.bundle.js"
    ]
  },
  "omnibox": {
    "keyword": "wksp"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{72a07873-9a21-4ad0-96fe-cc8b6c76fb06}"
    }
  }
}