Examine source code of Astrolabe

{
  "name": "Astrolabe",
  "version": "5resigned1",
  "default_locale": "en",
  "description": "__MSG_appDesc__",
  "icons": {
    "48": "48-1.png",
    "96": "96-1.png"
  },
  "browser_action": {
    "default_icon": "32-1.png"
  },
  "background": {
    "page": "background.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.3.1.slim.min.js",
        "astrolabe.js"
      ],
      "run_at": "document_end"
    }
  ],
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Period",
        "mac": "MacCtrl+Period"
      }
    }
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "webNavigation"
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{a90ec051-1784-4851-80a6-49a9d2067f0f}"
    }
  }
}