Examine source code of Tabulate

{
  "manifest_version" : 2 ,
  "name" : "__MSG_extension_name__" ,
  "description" : "__MSG_extension_description__" ,
  "version" : "0.0.18",
  "browser_specific_settings": {
    "gecko": {
      "id": "{65afae73-8786-42d1-a6e7-95dc884dfb3a}",
      "strict_min_version": "73.0"
    }
  },
  "permissions" : [
    "<all_urls>" ,
    "contextualIdentities" ,
    "cookies" ,
    "find" ,
    "sessions" ,
    "storage" ,
    "tabs" ,
    "tabHide" ,
    "theme" ,
    "unlimitedStorage" 
  ],
  "default_locale" : "en" ,
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "commands" : {
    "toggle-feature-sidebar": {
      "suggested_key": {
        "default": "Alt+Shift+U",
        "linux": "Ctrl+Shift+U"
      },
      "description" : "Send a 'toggle-feature-sidebar' event to the extension"
    }
  },
  "browser_action" : {
    "browser_style": true,
    "default_icon" : {
      "16" : "icons/tabulate-16.svg",
      "32" : "icons/tabulate-32.svg"
    },
    "default_title" : "__MSG_extension_name__" ,
    "default_popup" : "action.html",
    "theme_icons": [
      {
        "light": "icons/tabulate-16.svg",
        "dark": "icons/tabulate-16.svg",
        "size": 16
      },
      {
        "light": "icons/tabulate-32.svg",
        "dark": "icons/tabulate-32.svg",
        "size": 32
      }
    ]
  },
  "sidebar_action": {
    "default_icon" : {
      "16" : "icons/tabulate-16.svg",
      "32" : "icons/tabulate-32.svg"
    },
    "default_title" : "__MSG_sidebar_name__" ,
    "default_panel": "sidebar.html",
    "open_at_install": false
  },
  "options_ui" : {
    "browser_style": true,
    "page": "options.html" 
  }
}