Examine source code of Tab Sidebar

{
  "manifest_version": 2,
  "name": "Tab Sidebar",
  "version": "0.9",
  "description": "Adds a sidebar with foldable tabs.",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "64.0",
      "id": "{9b8ce341-744f-4f5d-9ff7-b5d7078a7b34}"
    }
  },
  "icons": {
    "48": "icon.svg"
  },
  "permissions": [
    "menus",
    "menus.overrideContext",
    "sessions",
    "storage",
    "tabs"
  ],
  "optional_permissions": [
    "bookmarks"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "sidebar_action": {
    "default_title": "Tabs",
    "default_panel": "sidebar.html",
    "default_icon": "empty.svg"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+F"
      }
    },
    "markertab1": {
      "description": "Activate the 1st marker tab"
    },
    "markertab2": {
      "description": "Activate the 2nd marker tab"
    },
    "markertab3": {
      "description": "Activate the 3rd marker tab"
    },
    "markertab4": {
      "description": "Activate the 4th marker tab"
    },
    "markertab5": {
      "description": "Activate the 5th marker tab"
    },
    "markertab6": {
      "description": "Activate the 6th marker tab"
    },
    "markertab7": {
      "description": "Activate the 7th marker tab"
    },
    "markertab8": {
      "description": "Activate the 8th marker tab"
    },
    "lastmarkertab": {
      "description": "Activate the last marker tab"
    }
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html",
    "browser_style": true
  }
}