Examine source code of List Submissions

{
  "manifest_version": 2,
  "name": "List_Submissions",
  "version": "2.0",
  "description": "This extension makes it easy for lectors to check the work of their students",
  "icons": {
    "48": "icons/List_Submissions_icon.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/List_Submissions_icon.png"
    },
    "default_title": "List Submissions"
  },
  "background": {
    "scripts": [
      "List_Submissions.js"
    ]
  },
  "permissions": [
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>",
    "cookies",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f9753ec5-48c7-4968-adb7-759deb9a05ba}"
    }
  }
}