Examine source code of Green Pi

{
  "name": "Green Pi",
  "version": "0.1.6",
  "description": "Beautiful math wherever you want.",
  "permissions": [
    "<all_urls>",
    "activeTab",
    "tabs"
  ],
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "background": {
    "persistent": false,
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "images/logo16.png",
    "32": "images/logo32.png",
    "48": "images/logo48.png",
    "128": "images/logo128.png"
  },
  "web_accessible_resources": [
    "fonts/*"
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/logo-gray16.png",
      "32": "images/logo-gray32.png",
      "48": "images/logo-gray48.png",
      "128": "images/logo-gray128.png"
    }
  },
  "applications": {
    "gecko": {
      "id": "{006969c6-f5e7-4dd6-ae1b-699fdf0e99a0}"
    }
  }
}