Examine source code of Backboard.io Sidebar

{
  "manifest_version": 2,
  "name": "Backboard Sidebar",
  "description": "Chat with a Backboard.io assistant that can see the current web page.",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "sidebar@backboard.io",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ]
      }
    }
  },
  "sidebar_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "Backboard",
    "default_panel": "sidebar/panel.html"
  },
  "permissions": [
    "storage",
    "tabs",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content/page-content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+B"
      }
    }
  }
}