Examine source code of Auction Photo Saver

{
  "manifest_version": 2,
  "name": "Auction Photo Saver",
  "version": "1.5.1",
  "description": "Download only the current AuctionTime or EquipmentFacts listing photos and create a photo-only PDF report.",
  "permissions": [
    "activeTab",
    "downloads",
    "tabs",
    "*://*.auctiontime.com/*",
    "*://*.equipmentfacts.com/*",
    "*://media.sandhills.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.auctiontime.com/listing/*",
        "*://*.equipmentfacts.com/listing/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Auction Photo Saver",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "96": "icon96.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "96": "icon96.png",
    "128": "icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "auction-photo-saver@local",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}