Examine source code of ShiftLeftClickDownloader

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "1.0.0",
  "description": "__MSG_extensionDescription__",
  "author": "__MSG_author__",
  "default_locale": "en",
  "icons": {
    "48": "icon.png",
    "64": "icon64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "match_about_blank": true,
      "all_frames": true,
      "js": [
        "data/mod-script.js",
        "data/svg_todataurl.js"
      ],
      "css": [
        "data/cssbase-context-min.css"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "bundle.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "downloads"
  ]
}