Examine source code of Pesticide

{
  "background": {
    "persistent": false,
    "scripts": [
      "pesticide-injector.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/toolbar-chrome.png",
      "38": "images/toolbar-chrome@2x.png"
    },
    "default_title": "Toggle Pesticide"
  },
  "description": "This extension inserts the Pesticide CSS into the current page, outlining each element to better see placement on the page.",
  "icons": {
    "16": "icon_16.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "manifest_version": 2,
  "name": "Pesticide for Firefox",
  "permissions": [
    "activeTab"
  ],
  "short_name": "Pesticide",
  "version": "1.1",
  "web_accessible_resources": [
    "pesticide.min.css",
    "pesticide.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5ca032f5-aaac-41f6-85eb-99ec4bfcf828}"
    }
  }
}