Examine source code of bandcamp pro

{
  "manifest_version": 2,
  "name": "bandcamp-killer-1.0",
  "version": "1.0",
  "description": "Kills Bandcamp. No, seriously, it just adds a link for unrestricted access to every album page.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bandcamp.com/album/*"
      ],
      "js": [
        "kill-bandcamp.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{a6c31da0-0c09-408f-89d2-878f7f2ebcad}"
    }
  }
}