Magic Text - зачеркнуть, подчеркнуть текст

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Magic Text - зачеркнуть, подчеркнуть текст",
  "short_name": "Magic Text",
  "description": "Простой способ форматировать текст в социальных сетях.",
  "version": "1.1.3",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "resources/icons/38.png",
    "icons": {
      "19": "resources/icons/19.png",
      "38": "resources/icons/38.png"
    }
  },
  "icons": {
    "16": "resources/icons/16.png",
    "48": "resources/icons/48.png",
    "128": "resources/icons/128.png"
  },
  "web_accessible_resources": [
    "resources/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://vk.com/*"
      ],
      "js": [
        "js/content.js"
      ],
      "css": [
        "css/content.css"
      ]
    }
  ],
  "permissions": [
    "*://*/*"
  ]
}