Examine source code of SelectionDownloader

{
  "description": "Download files from links and images in selected area without prompt",
  "manifest_version": 2,
  "name": "SelectionDownloader",
  "version": "0.7",
  "homepage_url": "https://github.com/Eivy/SelectionDownloader",
  "icons": {
    "16": "icons/collection.svg",
    "48": "icons/collection.svg",
    "96": "icons/collection.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "activeTab.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "menus",
    "activeTab",
    "downloads",
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "selectiondownloader@eivy"
    }
  }
}