Find website used fonts

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Find website used fonts",
  "description": "Find and list all the fonts used on a web page",
  "version": "2.0.2",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "32": "icons/icon32.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "96": "icons/icon96.png",
    "128": "icons/icon128.png",
    "256": "icons/icon256.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "javascripts/libraries/Font-Guess/font-guess.js",
        "javascripts/content.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/idle.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    },
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content-scripts/start.js"
      ],
      "all_frames": true,
      "run_at": "document_start"
    }
  ],
  "background": {
    "persistent": true,
    "scripts": [
      "javascripts/background.js"
    ]
  },
  "browser_action": {
    "default_title": "Find Font",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "modal/modal.html",
    "modal/modal.css",
    "modal/tooltip.css"
  ],
  "permissions": [
    "*://*/*",
    "tabs",
    "storage",
    "activeTab",
    "webRequest",
    "webRequestBlocking"
  ]
}