Examine source code of Let's Fish Sonar

{
  "manifest_version": 2,
  "name": "__MSG_ext_name__",
  "description": "__MSG_ext_desc__",
  "default_locale": "en",
  "version": "4.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{cfa30b67-df29-4f54-9468-27622d5ec648}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "tabs",
    "storage",
    "alarms",
    "https://letsfishfree.cheatenginebrasil.com.br/*",
    "https://fish-alawar.apps.tensquaregames.com/*",
    "https://fish-odno.apps.tensquaregames.com/*",
    "https://fish-tsg.apps.tensquaregames.com/*",
    "https://fish-desire.apps.tensquaregames.com/*",
    "https://fish-nk.apps.tensquaregames.com/*",
    "https://fish-kong.apps.tensquaregames.com/*",
    "https://fish-idnet.apps.tensquaregames.com/*",
    "https://fish-draug.apps.tensquaregames.com/*",
    "https://fish-fgamer.apps.tensquaregames.com/*",
    "https://fish-fb.apps.tensquaregames.com/*",
    "https://fish-vk.apps.tensquaregames.com/*",
    "https://fish-plinga.apps.tensquaregames.com/*",
    "https://fish-mini.apps.tensquaregames.com/*",
    "https://fish-gamexp.apps.tensquaregames.com/*",
    "https://fish-sg.apps.tensquaregames.com/*",
    "https://fish-rbk.apps.tensquaregames.com/*",
    "https://f1.lets-fish.com/*",
    "https://f2.lets-fish.com/*",
    "https://apps.facebook.com/*",
    "https://fish.gamexpconnect.com/*"
  ],
  "icons": {
    "16": "/icons/icon16.png",
    "48": "/icons/icon48.png",
    "128": "/icons/icon128.png"
  },
  "web_accessible_resources": [
    "/scripts/pageScript.js"
  ],
  "browser_action": {
    "default_icon": {
      "16": "/icons/icon16.png",
      "48": "/icons/icon48.png",
      "128": "/icons/icon128.png"
    },
    "default_title": "Let's Fish Sonar"
  },
  "content_scripts": [
    {
      "matches": [
        "https://letsfishfree.cheatenginebrasil.com.br/*",
        "https://fish-alawar.apps.tensquaregames.com/*",
        "https://fish-odno.apps.tensquaregames.com/*",
        "https://fish-tsg.apps.tensquaregames.com/*",
        "https://fish-desire.apps.tensquaregames.com/*",
        "https://fish-nk.apps.tensquaregames.com/*",
        "https://fish-kong.apps.tensquaregames.com/*",
        "https://fish-idnet.apps.tensquaregames.com/*",
        "https://fish-draug.apps.tensquaregames.com/*",
        "https://fish-fgamer.apps.tensquaregames.com/*",
        "https://fish-fb.apps.tensquaregames.com/*",
        "https://fish-vk.apps.tensquaregames.com/*",
        "https://fish-plinga.apps.tensquaregames.com/*",
        "https://fish-mini.apps.tensquaregames.com/*",
        "https://fish-gamexp.apps.tensquaregames.com/*",
        "https://fish-sg.apps.tensquaregames.com/*",
        "https://fish-rbk.apps.tensquaregames.com/*",
        "https://f1.lets-fish.com/*",
        "https://f2.lets-fish.com/*",
        "https://apps.facebook.com/*",
        "https://fish.gamexpconnect.com/*"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "js": [
        "/scripts/contentScript.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "/scripts/background.js"
    ],
    "persistent": false
  }
}