扩展拒绝加载manifest.json.1中的字体

Question

以下是我的 manifest.json ：

{
  "name": "gitvote",
  "version": "1.0",
  "manifest_version": 2,
  "description": "for git vote",
  "icons": {
    "128": "icons/icon.png"
  },
  "permissions": [
    "https://github.com/*",
    "https://gitlab.com/*",
    "storage"
  ],
  "optional_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [ "background.js" ],
    "persistent": false
  },
  "content_security_policy": "script-src 'self' https://ajax.googleapis.com; object-src 'self'"
}

当我将其作为chrome扩展程序运行时，出现错误：

'Refused to load the font 'data:font/woff;base64,d09GRgABAAAAAJd6ABIAAAABdegAAAAAAACWIAAAAVoAAAKDAAAAA…SYUnjpYfcSDw49uhYFPVe8dHZcYGS7Cfk4MMJ7zwjznvGw3PMA2Oo6+tf/wpSdPlSR/ADe7uPx' because it violates the following Content Security Policy directive: "font-src assets-cdn.github.com".' in manifest.json.1 occurs.

我不明白为什么manifest.json.1中会出现错误。

谢谢。