中文字數計算

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "中文字數計算",
  "description": "字數計算",
  "version": "1.0",
  "permissions": [
    "contextMenus"
  ],
  "options_page": "options.html",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "128": "abacus.png"
  },
  "manifest_version": 2
}