Examine source code of Raindrop Image Saver

{
  "manifest_version": 2,
  "name": "Raindrop Image Saver",
  "version": "1.0.0",
  "description": "Save multiple images from any website to your Raindrop.io collections.",
  "icons": {
    "16": "assets/icons/icon16.png",
    "48": "assets/icons/icon48.png",
    "96": "assets/icons/icon96.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "assets/icons/icon16.png",
      "48": "assets/icons/icon48.png"
    },
    "default_popup": "popup/popup.html",
    "default_title": "Save Images to Raindrop"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "raindrop-image-saver@extension",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ],
        "optional": []
      }
    }
  }
}