Examine source code of Tabs Keeper

{
  "manifest_version": 2,
  "name": "Tabs Manager",
  "description": "This extension allows to list, manipulate and save currently open tabs",
  "applications": {
    "gecko": {
      "id": "{b712e42b-de01-4c7e-895c-a420a6671f84}"
    }
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "/bg.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "Tabs Manager",
    "default_popup": "index.html",
    "theme_icons": [
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 16
      },
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 32
      },
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 48
      },
      {
        "light": "icons/icon-light.svg",
        "dark": "icons/icon-dark.svg",
        "size": 96
      }
    ]
  },
  "permissions": [
    "tabs",
    "storage"
  ],
  "version": "0.3.5"
}