Examine source code of EmojTea

{
  "name": "EmojTea",
  "version": "1.1",
  "description": "EmojTea plugin",
  "manifest_version": 2,
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "icons": {
    "512": "512.png"
  }
}