Examine source code of PeekProof

{
  "manifest_version": 2,
  "name": "PeekMask",
  "version": "1.2",
  "description": "Visit web pages comfortably in public places. Use the PeakMask",
  "icons": {
    "48": "assets/mask48.png"
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_action": {
    "default_icon": "assets/mask48.png",
    "default_title": "Peak proof",
    "default_popup": "index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "hover.js",
        "app.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{809d4272-354b-48f5-99c8-3e3e48d41594}"
    }
  }
}