Examine source code of HEC IMG Source replace

{
  "name": "__MSG_extName__",
  "default_locale": "fr",
  "version": "1.0.3",
  "description": "__MSG_extDescr__",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "manifest_version": 2
}