Examine source code of Set Aside

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "3",
  "description": "__MSG_extensionDescription__",
  "author": "Guido Berhoerster",
  "homepage_url": "https://code.guido-berhoerster.org/addons/firefox-addons/set-aside/",
  "default_locale": "en",
  "applications": {
    "gecko": {
      "id": "set-aside@code.guido-berhoerster.org",
      "strict_min_version": "60.0"
    }
  },
  "icons": {
    "48": "icons/set-aside-48.png",
    "96": "icons/set-aside-96.png"
  },
  "permissions": [
    "tabs",
    "storage",
    "sessions",
    "menus",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_area": "tabstrip",
    "default_title": "__MSG_defaultBrowserActionTitle__",
    "theme_icons": [
      {
        "dark": "icons/set-aside-action-dark-16.png",
        "light": "icons/set-aside-action-light-16.png",
        "size": 16
      },
      {
        "dark": "icons/set-aside-action-dark-32.png",
        "light": "icons/set-aside-action-light-32.png",
        "size": 32
      }
    ]
  },
  "sidebar_action": {
    "browser_style": true,
    "default_icon": {
      "16": "icons/set-aside-sidebar-16.png",
      "32": "icons/set-aside-sidebar-32.png"
    },
    "default_panel": "sidebar/tab-collection-manager.html",
    "default_title": "__MSG_defaultSidebarTitle__",
    "open_at_install": false
  }
}