Examine source code of RYM Genre Scraper

{
  "manifest_version": 2,
  "name": "RYM Genre Scraper",
  "version": "1.0",
  "description": "Add RateYourMusic genres on SensCritique musical records",
  "icons": {
    "48": "icons/sc.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.senscritique.com/*"
      ],
      "js": [
        "scraper.js"
      ]
    }
  ],
  "permissions": [
    "*://*.rateyourmusic.com/album/*",
    "tabs"
  ]
}