Examine source code of Window Saver

{
  "manifest_version": 2,
  "version": "1.7.1",
  "default_locale": "en",
  "name": "Window Saver",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/jonhac/Window-Saver",
  "browser_specific_settings": {
    "gecko": {
      "id": "{18f88f40-01fb-4324-86cb-f99cd32f2de4}",
      "strict_min_version": "57.0"
    }
  },
  "icons": {
    "96": "icons/dark.svg"
  },
  "permissions": [
    "bookmarks",
    "tabs",
    "storage"
  ],
  "incognito": "spanning",
  "background": {
    "page": "./background/background_page.html",
    "persistent": false
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "browser_action": {
    "default_title": "Window Saver",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/dark.svg",
      "32": "icons/dark.svg",
      "64": "icons/dark.svg",
      "128": "icons/dark.svg"
    },
    "theme_icons": [
      {
        "size": 16,
        "light": "icons/light.svg",
        "dark": "icons/dark.svg"
      },
      {
        "size": 32,
        "light": "icons/light.svg",
        "dark": "icons/dark.svg"
      },
      {
        "size": 64,
        "light": "icons/light.svg",
        "dark": "icons/dark.svg"
      },
      {
        "size": 128,
        "light": "icons/light.svg",
        "dark": "icons/dark.svg"
      }
    ]
  }
}