Count me up - Word and character counter

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "1.0",
  "description": "__MSG_extDescription__",
  "default_locale": "en",
  "icons": {
    "128": "./assets/images/128x128-icon.png"
  },
  "background": {
    "scripts": [
      "./background/background.js"
    ]
  },
  "browser_action": {
    "default_title": "__MSG_extName__",
    "default_icon": "./assets/images/128x128-icon.png",
    "default_popup": "./popup/popup.html"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./content_script/content_script.js"
      ]
    }
  ],
  "permissions": [
    "contextMenus",
    "storage"
  ],
  "web_accessible_resources": [
    "popup/popup.html"
  ]
}