manifest.json

{

  "manifest_version": 2,
  "name": "Mark Wrap",
  "description": "This extension wraps the selected text in a markdown link with the contents of the clipboard",
  "version": "0.1",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },

  "permissions": [
    "activeTab",
    "clipboardRead"
  ],

  "commands": {
    "toggle-feature-foo": {
      "suggested_key": {
        "default": "Ctrl+Shift+V",
        "mac": "Command+Shift+V"
      },
      "description": "Toggle feature foo"
    }
  },

  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "contentscript.js"
      ]
    }
  ],

  "icons": {
    "19": "assets/icon19.png",
    "38": "assets/icon38.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  }
}