Examine source code of ftt

{
  "manifest_version": 2,
  "name": "ftt",
  "description": "A tab tree addon",
  "version": "0.4.9",
  "applications": {
    "gecko": {
      "id": "{8d808887-ed13-4931-9f5a-4c0bff979a5a}",
      "strict_min_version": "67.0"
    }
  },
  "sidebar_action": {
    "default_title": "ftt",
    "default_panel": "sidebar.html"
  },
  "background": {
    "scripts": [
      "extern/js-syncqueue/src.js",
      "extern/we-tabcache/src.js",
      "js/jumptable.js",
      "js/tree.js",
      "js/debug.js",
      "js/menu.js",
      "js/api.js",
      "js/locales.js",
      "js/background.js"
    ]
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "F1"
      },
      "description": "Toggle sidebar"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "bookmarks",
    "cookies",
    "contextualIdentities",
    "menus",
    "menus.overrideContext",
    "sessions",
    "storage",
    "tabs"
  ],
  "default_locale": "en"
}