Examine source code of Bandcamp Dig

{
  "manifest_version": 2,
  "name": "Bandcamp Dig",
  "version": "2.0.2",
  "description": "Build a listening queue for Bandcamp tracks",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage",
    "*://*.bandcamp.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-48.png"
    },
    "default_popup": "popup.html",
    "default_title": "Bandcamp Dig"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bandcamp.com/*"
      ],
      "js": [
        "drawer.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    },
    {
      "matches": [
        "*://bandcampdig.dirkdirk.com/*"
      ],
      "js": [
        "website.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "bandcampdig_live@dirkdirk.com",
      "strict_min_version": "109.0"
    }
  },
  "web_accessible_resources": [
    "spin.apng"
  ]
}