Examine source code of DwTrans

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://acnt.dual-d.net/cgi-bin/form.cgi?*"
      ],
      "js": [
        "autologin.js"
      ]
    },
    {
      "matches": [
        "http://wdme3.dual-d.net/"
      ],
      "js": [
        "toppage.js"
      ]
    }
  ],
  "description": "Context menu to translate with Sanseido Dual Wisdom Eiwa",
  "icons": {
    "64": "icon.png"
  },
  "manifest_version": 2,
  "name": "DwTrans",
  "permissions": [
    "tabs",
    "menus",
    "clipboardRead",
    "https://acnt.dual-d.net/cgi-bin/form.cgi?*",
    "*://*.dual-d.net/*"
  ],
  "version": "1"
}