Examine source code of Stylerific

{
  "manifest_version": 2,
  "name": "Stylerific",
  "version": "1.3resigned1",
  "description": "Stylerific is a plugin that gives users the ability to add custom CSS to their favorite webpages, on a per-domain basis.",
  "browser_action": {
    "default_icon": "icons/browser-32.png",
    "default_title": "Stylerific",
    "default_popup": "popups/set_styles.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "{87f10022-5e42-49fa-b439-29d832c0382b}"
    }
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "storage",
    "tabs",
    "webNavigation"
  ]
}