Examine source code of palm

{
  "name": "palm",
  "manifest_version": 2,
  "version": "0.1",
  "description": "the browser's missing explore tab",
  "browser_action": {
    "default_popup": "palm.html",
    "browser_style": true,
    "default_icon": {
      "16": "images/icon-16-light.png",
      "32": "images/icon-32-light.png"
    },
    "theme_icons": [
      {
        "light": "images/icon-16-light.png",
        "dark": "images/icon-16-dark.png",
        "size": 16
      },
      {
        "light": "images/icon-32-light.png",
        "dark": "images/icon-32-dark.png",
        "size": 32
      }
    ]
  },
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e823017-5b83-483c-aaa7-402c89aca162}"
    }
  }
}