Examine source code of Forgotten Classrooms

{
  "manifest_version": 2,
  "name": "Forgotten Classrooms",
  "version": "1.0",
  "description": "This extension enables students to locally hide forgotten classrooms which the teacher hasn't archived yet.",
  "homepage_url": "https://github.com/emmanuelsdias/forgotten-classrooms",
  "icons": {
    "16": "icons/forgotten-classrooms-16.png",
    "24": "icons/forgotten-classrooms-24.png",
    "32": "icons/forgotten-classrooms-32.png",
    "48": "icons/forgotten-classrooms-48.png",
    "64": "icons/forgotten-classrooms-64.png",
    "128": "icons/forgotten-classrooms-128.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.classroom.google.com/*"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "page_action": {
    "default_title": "Forgotten Classrooms",
    "default_popup": "popup/popup.html",
    "show_matches": [
      "https://*.classroom.google.com/*"
    ],
    "default_icon": {
      "19": "icons/forgotten-classrooms-19.png",
      "32": "icons/forgotten-classrooms-32.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3eb57695-ac72-45ea-b661-351925b5a80e}"
    }
  }
}