Examine source code of YorkURMP

{
  "manifest_version": 2,
  "name": "YorkRMP",
  "description": "RMP extension for YorkU's course page.",
  "version": "1.0",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "activeTab",
    "webRequest",
    "https://w2prod.sis.yorku.ca/*",
    "https://www.ratemyprofessors.com/*"
  ],
  "background": {
    "scripts": [
      "background-packed.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://w2prod.sis.yorku.ca/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b91879db-cdf5-420e-8f21-b9e18987e2af}"
    }
  }
}