Examine source code of saveIN -> reading list

{
  "manifest_version": 2,
  "name": "saveIN : Your personal bookmarks",
  "version": "4.0.8.9",
  "author": "sp4ce",
  "description": "Bookmark any page instantly and keep everything organized with folders",
  "permissions": [
    "storage",
    "tabs",
    "bookmarks"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "F1"
      },
      "description": "Toggle saveIN"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "saveIN : Your personal bookmarks",
    "default_panel": "index.html",
    "default_icon": {
      "256": "images/icon.png"
    }
  },
  "icons": {
    "256": "images/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "favory@sp4ce.pw"
    }
  }
}