Examine source code of Twitter Sidebar Client - Twit Side 2

{
  "manifest_version": 2,
  "name": "Twit Side 2",
  "author": "tukapiyo",
  "developer": {
    "name": "tukapiyo",
    "url": "https://www2.filewo.net/"
  },
  "description": "__MSG_extensionDescription__",
  "version": "1.1.2",
  "applications": {
    "gecko": {
      "id": "twit-side@filewo.net",
      "strict_min_version": "100.0"
    }
  },
  "default_locale": "en",
  "icons": {
    "48": "images/logo.svg",
    "96": "images/logo.svg"
  },
  "sidebar_action": {
    "browser_style": false,
    "default_icon": "images/logo-16.png",
    "default_title": "Twit Side",
    "default_panel": "ui/sidebar.xhtml"
  },
  "browser_action": {
    "browser_style": false,
    "default_icon": {
      "16": "images/logo-16.png",
      "32": "images/logo-32.png"
    },
    "default_title": "Twit Side",
    "default_area": "navbar"
  },
  "options_ui": {
    "page": "preference/pref.xhtml"
  },
  "commands": {
    "_execute_sidebar_action": {
      "suggested_key": {
        "default": "Alt+Shift+J"
      },
      "description": "__MSG_extensionToggleSidebar__"
    },
    "focus-newtweet": {
      "suggested_key": {
        "default": "Alt+Shift+K"
      },
      "description": "__MSG_extensionFocusNewtweet__"
    }
  },
  "background": {
    "scripts": [
      "scripts/defaultprefs.js",
      "scripts/twitside.js",
      "scripts/text-ope.js",
      "scripts/common_code.js",
      "scripts/url.js",
      "scripts/tweet.js",
      "scripts/message.js",
      "scripts/manage_windows.js",
      "scripts/manage_users.js",
      "scripts/manage_columns.js",
      "scripts/friends.js",
      "scripts/mutes.js",
      "scripts/lists.js",
      "scripts/directmessages.js",
      "scripts/timeline.js",
      "scripts/background_main.js"
    ]
  },
  "permissions": [
    "webRequest",
    "https://*.twitter.com/*",
    "https://*.filewo.net/*",
    "notifications",
    "storage",
    "tabs"
  ],
  "incognito": "not_allowed"
}