Examine source code of all reload

{
  "manifest_version": 2,
  "name": "all-reload",
  "version": "1.2.1",
  "description": "You can reload all tabs from context menu.",
  "icons": {
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png"
  },
  "background": {
    "scripts": [
      "src/all-reload.js",
      "src/main.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "all_reload@kakakikikeke.blogspot.com"
    }
  },
  "permissions": [
    "menus",
    "tabs"
  ],
  "default_locale": "en",
  "homepage_url": "https://blog.kakakikikeke.com/2012/07/firefoxall-reload.html"
}