Web Page font replacement

You can force a web page to use your own custom font, making the font defined by CSS invalid.
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manifest.json
{
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "js/fn.js",
        "js/style.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_start"
    }
  ],
  "default_locale": "zh_CN",
  "description": "__MSG_EXT_DESCRIPTION__",
  "icons": {
    "48": "images/icon_48.png",
    "64": "images/icon_64.png",
    "128": "images/icon_128.png"
  },
  "manifest_version": 2,
  "minimum_chrome_version": "22",
  "name": "__MSG_EXT_NAME__",
  "options_page": "options/options.html",
  "permissions": [
    "http://*/*",
    "https://*/*",
    "tabs",
    "storage",
    "unlimitedStorage",
    "fontSettings"
  ],
  "version": "1.2.0",
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}