Examine source code of Switch Container Plus

{
  "manifest_version" : 2 ,
  "name" : "Switch Container Plus",
  "short_name" : "SwitchConPlus",
  "author": "stoically",
  "description" : "Allows to switch the current tab to a different container in multiple ways",
  "version" : "0.19",
  "icons" : {
    "48" : "switch_container-48.svg",
    "96" : "switch_container-96.svg"
  },
  "browser_action" : {
    "browser_style": true,
    "default_title" : "Switch Container",
    "default_popup" : "switch_popup.html",
    "default_icon" : {
      "16" : "switch_container-browseraction-16.svg",
      "32" : "switch_container-browseraction-32.svg"
    },
    "theme_icons": [
      {
        "light": "switch_container-browseraction-dark-16.svg",
        "dark": "switch_container-browseraction-16.svg",
        "size": 16
      },
      {
        "light": "switch_container-browseraction-dark-32.svg",
        "dark": "switch_container-browseraction-32.svg",
        "size": 32
      }
    ]
  },
  "options_ui" : {
    "page": "options.html" ,
    "browser_style": true
  },
  "permissions" : [
    "tabs" ,
    "activeTab" ,
    "cookies" ,
    "contextualIdentities" ,
    "storage" 
  ],
  "background" : {
    "scripts" : [
      "psl.min.js" ,
      "background.js" 
    ]
  },
  "omnibox": {
    "keyword": "co"
  },
  "applications": {
    "gecko": {
      "id": "{d5ac33ed-723c-402b-b17c-e7bbb0d3a80d}",
      "strict_min_version": "57.0"
    }
  }
}