Simple Character Count

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Simple Character Count",
  "description": "The Simple Character & Word Count",
  "version": "0.0.2",
  "permissions": [
    "<all_urls>",
    "http://*/*",
    "https://*/*"
  ],
  "content_scripts": [
    {
      "js": [
        "assets/browser-checker.js",
        "assets/jquery-3.1.0.min.js",
        "contentscript/contentscript.js"
      ],
      "run_at": "document_end",
      "all_frames": true,
      "matches": [
        "<all_urls>",
        "http://*/*",
        "https://*/*"
      ]
    }
  ],
  "browser_action": {
    "default_icon": "images/logo.png",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "page": "background/background.html",
    "persistent": true
  },
  "icons": {
    "48": "images/logo.png"
  },
  "content_security_policy": "script-src 'self' https://www.googleapis.com https://cdnjs.cloudflare.com; object-src 'self';"
}