Examine source code of Talking Points Modder

{
  "description": "Patches the jackbox.tv page to use a custom CSS along with custom images.",
  "manifest_version": 2,
  "name": "Talking Points Modder",
  "version": "0.2",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://jackbox.tv/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0d2cf15-8099-4ae6-b7d6-a02119e4643e}"
    }
  }
}