Examine source code of DPImageDownloader

{
  "author": "DP",
  "manifest_version": 2,
  "name": "DPImageDownloader",
  "version": "1.10.2resigned1",
  "applications": {
    "gecko": {
      "id": "imageDownloader@imageDownloader.com",
      "strict_min_version": "52.0"
    }
  },
  "description": "Grab and download images by monitoring network requests. You can filter by size, width, height and by tabs with similar host or titles. You can choose a global subfolder where the pictures will be stored and an addictional subfolder for each download batch.",
  "icons": {
    "64": "images/icons/cloud-computing-64.png"
  },
  "permissions": [
    "<all_urls>",
    "tabs",
    "webRequest",
    "downloads",
    "downloads.open",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icons/cloud-computing-16.png",
      "32": "images/icons/cloud-computing-32.png"
    },
    "default_title": "DPImageDownloader",
    "default_popup": "views/download.html",
    "theme_icons": [
      {
        "light": "images/icons/cloud-computing-32.png",
        "dark": "images/icons/cloud-computing-32.png",
        "size": 32
      }
    ]
  },
  "options_ui": {
    "page": "views/settings.html"
  },
  "background": {
    "page": "background-page.html"
  }
}