Examine source code of Bandcamp Tagger

{
  "manifest_version": 2,
  "name": "Bandcamp Tagger",
  "version": "0.9.3",
  "description": "A lightweight extension that adds tagging functionality to your Bandcamp collection and wishlist. Organize and filter your music easily with custom tags.",
  "icons": {
    "48": "icons/trapper-48.png",
    "96": "icons/trapper-96.png"
  },
  "permissions": [
    "storage",
    "*://*.bandcamp.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.bandcamp.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{caf72608-4d8e-4a21-ac58-d6c1ce553435}"
    }
  }
}