Examine source code of TrackDen

{
  "name": "TrackDen",
  "description": "Organize your online music collection across Bandcamp & Beatport. Preview tracks, create playlists, sync carts & wishlists.",
  "version": "0.1.6",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "addon@trackden.org",
      "strict_min_version": "128.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "css/img/png/icon-inactive-16.png",
      "32": "css/img/png/icon-inactive-32.png",
      "48": "css/img/png/icon-inactive-48.png",
      "128": "css/img/png/icon-inactive-128.png"
    }
  },
  "icons": {
    "16": "css/img/png/icon-active-16.png",
    "32": "css/img/png/icon-active-32.png",
    "48": "css/img/png/icon-active-48.png",
    "128": "css/img/png/icon-active-128.png"
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "unlimitedStorage",
    "declarativeContent",
    "downloads",
    "alarms",
    "webNavigation",
    "scripting"
  ],
  "host_permissions": [
    "https://*.bandcamp.com/*",
    "https://www.beatport.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.bandcamp.com/track/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-track.js",
        "js/content-scripts/bandcamp-cart.js"
      ]
    },
    {
      "matches": [
        "https://bandcamp.com/*/wishlist"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-wishlist.js"
      ]
    },
    {
      "matches": [
        "https://*.bandcamp.com/album/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-album.js",
        "js/content-scripts/bandcamp-cart.js"
      ]
    },
    {
      "matches": [
        "https://bandcamp.com/cart"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-cart.js"
      ]
    },
    {
      "matches": [
        "https://bandcamp.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-purchases.js",
        "js/content-scripts/bandcamp-search.js",
        "js/content-scripts/bandcamp-autocomplete.js"
      ],
      "css": [
        "css/contentScriptCss.css"
      ]
    },
    {
      "matches": [
        "https://*.bandcamp.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-artist.js",
        "js/content-scripts/bandcamp-autocomplete.js"
      ],
      "css": [
        "css/contentScriptCss.css"
      ]
    },
    {
      "matches": [
        "https://*.bandcamp.com/download/track/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/bandcamp-purchase-confirm.js"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/track/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-track.js"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/release/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-release.js"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/library/playlists/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-playlist.js"
      ],
      "css": [
        "css/contentScriptCss.css"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/search*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/general/beatportFetch.js",
        "js/content-scripts/beatport-search.js"
      ],
      "css": [
        "css/contentScriptCss.css"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/artist/*/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-artist.js"
      ],
      "css": [
        "css/contentScriptCss.css"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/cart",
        "https://www.beatport.com/cart/*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-cart.js"
      ]
    },
    {
      "matches": [
        "https://www.beatport.com/library*",
        "https://www.beatport.com/my-beatport*"
      ],
      "run_at": "document_idle",
      "js": [
        "js/general/contentScriptHelpers.js",
        "js/content-scripts/beatport-library.js"
      ]
    }
  ],
  "options_page": "html/popup.html"
}