Examine source code of Private Notes

{
  "manifest_version": 2,
  "version": "4.2",
  "author": "Juraj Mäsiar",
  "default_locale": "en",
  "name": "__MSG_app_name__",
  "description": "__MSG_app_desc__",
  "icons": {
    "48": "48.png",
    "128": "128.png"
  },
  "background": {
    "page": "background/background_pn.html"
  },
  "browser_action": {
    "default_icon": {
      "128": "128.png"
    },
    "default_popup": "popup/popup.html"
  },
  "commands": {
    "open_editor": {
      "suggested_key": {
        "default": "Alt+P"
      },
      "description": "Open Private Notes in popup window."
    },
    "open_new_tab": {
      "suggested_key": {
        "default": "Alt+Shift+P"
      },
      "description": "Open Private Notes in new tab."
    },
    "open_sidebar": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Open Private Notes in the Sidebar."
    }
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "sidebar_action": {
    "default_icon": {
      "128": "128.png"
    },
    "default_panel": "popup/popup.html#_sidebar",
    "open_at_install": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "admin@fastaddons.com_PrivateNotes",
      "strict_min_version": "68.0"
    }
  }
}