Examine source code of Tree Tabs Refreshed

{
  "manifest_version": 2,
  "default_locale": "en",
  "background": {
    "scripts": [
      "global.js",
      "./scripts/preferences.js",
      "background_firefox.js",
      "background.js"
    ],
    "persistent": true
  },
  "name": "Tree Tabs Refreshed",
  "description": "__MSG_extDesc__",
  "icons": {
    "16": "icons/16.png",
    "24": "icons/24.png",
    "38": "icons/38.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "tabs",
    "sessions",
    "storage",
    "unlimitedStorage",
    "bookmarks",
    "tabHide",
    "alarms",
    "downloads"
  ],
  "sidebar_action": {
    "default_icon": {
      "16": "icons/16.png",
      "24": "icons/24.png",
      "38": "icons/38.png"
    },
    "default_panel": "sidebar.html",
    "default_title": "Tree Tabs Refreshed",
    "browser_style": false
  },
  "browser_action": {
    "default_icon": {
      "16": "icons/16.png",
      "24": "icons/24.png",
      "38": "icons/38.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tree-tabs-refreshed@bapohka",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "options_ui": {
    "page": "options/options.html",
    "open_in_tab": true
  },
  "commands": {
    "close_tree": {
      "suggested_key": {
        "default": "Alt+W"
      },
      "description": "close tree"
    }
  },
  "version": "1.10.2"
}