Examine source code of SkipIfFake: AI Music Detector

{
  "manifest_version" : 3 ,
  "name" : "__MSG_extName__" ,
  "description" : "__MSG_extDescription__" ,
  "version" : "1.3.0",
  "icons" : {
    "16" : "icon/16.png",
    "48" : "icon/48.png",
    "128" : "icon/128.png"
  },
  "default_locale" : "en" ,
  "permissions" : [
    "storage" ,
    "notifications" ,
    "scripting" 
  ],
  "host_permissions" : [
    "https://www.skipiffake.com/*" ,
    "https://open.spotify.com/*" ,
    "https://music.youtube.com/*" ,
    "https://music.apple.com/*" ,
    "https://www.deezer.com/*" ,
    "https://deezer.com/*" 
  ],
  "action" : {
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "icon/16.png",
      "48" : "icon/48.png",
      "128" : "icon/128.png"
    },
    "default_title" : "SkipIfFake"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "skipiffake@skipiffake.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo",
          "websiteActivity",
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "content_scripts" : [
    {
      "matches" : [
        "https://deezer.com/*" ,
        "https://music.apple.com/*" ,
        "https://music.youtube.com/*" ,
        "https://open.spotify.com/*" ,
        "https://www.deezer.com/*" 
      ],
      "all_frames" : true ,
      "js" : [
        "content-scripts/bridge.js" 
      ]
    },
    {
      "matches" : [
        "https://deezer.com/*" ,
        "https://music.apple.com/*" ,
        "https://music.youtube.com/*" ,
        "https://open.spotify.com/*" ,
        "https://www.deezer.com/*" 
      ],
      "all_frames" : true ,
      "run_at" : "document_start" ,
      "js" : [
        "content-scripts/mediasession.js" 
      ],
      "world" : "MAIN" 
    }
  ]
}