Examine source code of Tab Utility

{
  "applications": {
    "gecko": {
      "strict_min_version": "58.0a1"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "browser_style": true,
    "default_title": "Tab Utility",
    "default_icon": {
      "64": "icons/logo_64.png"
    },
    "default_popup": "tabs.html"
  },
  "description": "Many useful things you can perform on a tab.",
  "homepage_url": "https://github.com/nabendu82/Addons",
  "manifest_version": 2,
  "name": "Tab Utility",
  "permissions": [
    "tabs"
  ],
  "version": "2.0",
  "icons": {
    "32": "icons/logo_32.png",
    "64": "icons/logo_64.png"
  }
}