Examine source code of TCG Connect Browser Extension

{
  "manifest_version": 2,
  "name": "TCG Connect Browser Extension",
  "version": "1.4",
  "description": "Right-click images to scan them with TCG Connect.",
  "permissions": [
    "contextMenus",
    "notifications",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "icons": {
    "48": "icon.png",
    "128": "icon-128.png"
  },
  "browser_action": {
    "default_title": "TCG Connect",
    "default_icon": "icon.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c4ae9948-c85d-4370-bfb7-490f0ec90369}"
    },
    "web_accessible_resources": [
      "injected.js"
    ]
  }
}