Examine source code of Painel do Messenger

{
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "default_locale": "br",
  "version": "1.1.1",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "icons/icon.svg",
      "38": "icons/icon.svg"
    },
    "default_popup": "html/popup.html",
    "default_title": "__MSG_extensionName__"
  },
  "sidebar_action": {
    "default_title": "__MSG_extensionName__",
    "default_panel": "html/sidebar.html",
    "default_icon": "icons/icon.svg"
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "contextualIdentities",
    "cookies",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "contextMenus",
    "storage",
    "<all_urls>"
  ],
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+M",
        "mac": "Alt+Shift+M"
      }
    }
  }
}