Examine source code of Stop Peeking!

{
  "description": "A tool for sending and receiving encrypted emails.",
  "version": "0.0.4resigned1",
  "name": "Stop Peeking!",
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon-34.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*"
      ],
      "js": [
        "gmail.bundle.js"
      ]
    },
    {
      "matches": [
        "https://mail.yahoo.com/*"
      ],
      "js": [
        "yahoo.bundle.js"
      ]
    },
    {
      "matches": [
        "https://outlook.live.com/*"
      ],
      "js": [
        "outlook.bundle.js"
      ]
    }
  ],
  "icons": {
    "128": "icon-128.png"
  },
  "manifest_version": 2,
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{b067d3b5-b898-4ea9-b0ce-f750847866f9}"
    }
  }
}