Examine source code of Save-To-Read

{
  "applications": {
    "gecko": {
      "id": "save2read@konstantin.plotnikov",
      "strict_min_version": "56.0"
    }
  },
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "name": "Save-To-Read",
  "version": "1.3resigned1",
  "homepage_url": "https://addons.mozilla.org/firefox/addon/161878/",
  "icons": {
    "32": "icons/save2read.png"
  },
  "permissions": [
    "bookmarks",
    "tabs",
    "activeTab",
    "storage"
  ],
  "sidebar_action": {
    "default_title": "Save-To-Read",
    "default_icon": "icons/save2read.png",
    "default_panel": "src/sidebar.html"
  },
  "browser_action": {
    "default_icon": "icons/save2read.png",
    "default_title": "Open sidebar",
    "default_popup": "src/popup.html"
  },
  "page_action": {
    "default_icon": "icons/add.png"
  },
  "background": {
    "scripts": [
      "src/i18n.js",
      "src/signal.js",
      "src/options.js",
      "src/bookmarks.js",
      "src/background.js"
    ]
  },
  "options_ui": {
    "page": "src/options-ui.html"
  },
  "default_locale": "en"
}