Examine source code of Website SideNotes

{
  "manifest_version": 2,
  "name": "Website SideNotes",
  "description": "Displays a sidebar that lets you take notes on web pages.",
  "version": "1.0",
  "icons": {
    "64": "icons/logo_64.png",
    "128": "icons/logo_128.png"
  },
  "applications": {
    "gecko": {
      "strict_min_version": "52.0a1"
    }
  },
  "sidebar_action": {
    "default_icon": "icons/logo_64.png",
    "default_title": "SideNotes",
    "default_panel": "sidebar/panel.html"
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Y"
      }
    }
  }
}