Examine source code of Reload Every Tabs

{
  "manifest_version": 2,
  "name": "Reload All Tabs",
  "version": "1.0",
  "description": "Reloads all tabs in the current window.",
  "browser_action": {
    "default_title": "Reload All Tabs",
    "default_icon": {
      "64": "icon64.png",
      "128": "icon128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{850eeba0-feb5-4675-941b-fc3f2172715b}",
      "strict_min_version": "120.0"
    }
  }
}