Examine source code of GoGoAnime Plus

{
  "manifest_version": 2,
  "name": "GoGoAnime Plus",
  "version": "0.3.1",
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "description": "Adds a watch tracker to gogoanime.io",
  "icons": {
    "16": "res/icon-16.png",
    "32": "res/icon-32.png",
    "48": "res/icon-48.png",
    "128": "res/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "GoGoAnimePlus@nodomain.com",
      "strict_min_version": "55.0"
    }
  },
  "browser_action": {
    "default_icon": {
      "32": "res/icon-32.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.gogoanime.io/category/*"
      ],
      "js": [
        "js/showPage/episodeGrid.js"
      ]
    },
    {
      "matches": [
        "*://*.gogoanime.io/*"
      ],
      "exclude_matches": [
        "*://*.gogoanime.io/category/*",
        "*://*.gogoanime.io/*.html"
      ],
      "all_frames": false,
      "js": [
        "js/watchPage/watchPage.js",
        "js/watchPage/watchButton.js",
        "js/watchPage/episodeGrid.js"
      ]
    }
  ]
}