Easy to Save Image As (名前を付けて画像を保存)

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Easy to Save Image As (名前を付けて画像を保存)",
  "short_name": "Etosia",
  "version": "1.2.3.0",
  "manifest_version": 2,
  "description": "\"Save Image As\" can be easily done with any key + click. Multiple keys can be set.   「名前を付けて画像を保存」を任意のキー＋クリックで行えるようにします。キーは複数設定可能です。",
  "icons": {
    "32": "icon/icon_32.png",
    "48": "icon/icon_48.png",
    "128": "icon/icon_128.png"
  },
  "permissions": [
    "background",
    "storage",
    "downloads",
    "clipboardWrite"
  ],
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "lib/jquery.js",
        "content-script.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icon/icon_128.png",
    "default_title": "Easy to Save Image As",
    "default_popup": "save-image-as.html"
  }
}