Examine source code of Tab Backup

{
  "manifest_version" : 3 ,
  "name" : "Tab Backup",
  "version" : "0.2.3",
  "description" : "Stash tabs into groups and back up your tabs and stash to a local folder, Google Drive, OneDrive or Dropbox.",
  "browser_specific_settings": {
    "gecko": {
      "id": "tab-backup@dimitrije-petrovic",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [
          "browsingActivity",
          "bookmarksInfo"
        ]
      }
    }
  },
  "icons" : {
    "48" : "icons/icon.svg",
    "96" : "icons/icon.svg"
  },
  "permissions" : [
    "alarms" ,
    "bookmarks" ,
    "contextualIdentities" ,
    "cookies" ,
    "downloads" ,
    "identity" ,
    "menus" ,
    "storage" ,
    "tabGroups" ,
    "tabs" ,
    "unlimitedStorage" 
  ],
  "optional_permissions" : [
    "nativeMessaging" 
  ],
  "background" : {
    "scripts" : [
      "background.js" 
    ],
    "type" : "module" 
  },
  "action" : {
    "default_title" : "Tab Backup",
    "default_icon" : "icons/icon.svg"
  },
  "sidebar_action": {
    "default_title" : "Tab Backup",
    "default_panel": "ui/sidebar/index.html",
    "default_icon" : "icons/icon.svg",
    "open_at_install": false
  },
  "options_ui" : {
    "page": "ui/options/index.html" ,
    "open_in_tab": true
  },
  "commands" : {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+B"
      },
      "description" : "Show or hide the Tab Backup sidebar"
    },
    "stash-window": {
      "suggested_key": {
        "default": "Alt+Shift+S"
      },
      "description" : "Stash all tabs in the current window"
    },
    "stash-tab": {
      "description" : "Stash the current tab"
    },
    "backup-now": {
      "description" : "Back up now to all enabled destinations"
    }
  }
}