Examine source code of 2ch-helper

{
  "manifest_version": 2,
  "name": "2ch-helper",
  "short_name": "2ch-helper",
  "version": "1.2.2resigned1",
  "description": "Облегчение взаимодействия с имиджбордой 2ch.hk.",
  "author": "Sergey Kuznetsov",
  "homepage_url": "https://github.com/Amaimersion/2ch-helper",
  "options_ui": {
    "page": "/interface/html/settings.html",
    "open_in_tab": true,
    "browser_style": true
  },
  "browser_action": {
    "default_title": "2ch-helper",
    "default_popup": "/interface/html/popup.html",
    "default_icon": {
      "16": "/interface/icons/logo/logo-16.png",
      "32": "/interface/icons/logo/logo-32.png",
      "48": "/interface/icons/logo/logo-48.png",
      "128": "/interface/icons/logo/logo-128.png"
    },
    "browser_style": true
  },
  "icons": {
    "16": "/interface/icons/logo/logo-16.png",
    "32": "/interface/icons/logo/logo-32.png",
    "48": "/interface/icons/logo/logo-48.png",
    "128": "/interface/icons/logo/logo-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://2ch.hk/*",
        "*://2ch.pm/*",
        "*://2ch.re/*",
        "*://2ch.tf/*",
        "*://2ch.wf/*",
        "*://2ch.yt/*"
      ],
      "js": [
        "/interaction/js/content.min.js"
      ]
    },
    {
      "matches": [
        "*://2ch.hk/*/res/*",
        "*://2ch.pm/*/res/*",
        "*://2ch.re/*/res/*",
        "*://2ch.tf/*/res/*",
        "*://2ch.wf/*/res/*",
        "*://2ch.yt/*/res/*"
      ],
      "css": [
        "/interaction/css/custom-thread.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "/interaction/js/background.min.js"
    ]
  },
  "permissions": [
    "storage",
    "downloads",
    "activeTab",
    "notifications",
    "*://2ch.hk/*",
    "*://2ch.pm/*",
    "*://2ch.re/*",
    "*://2ch.tf/*",
    "*://2ch.wf/*",
    "*://2ch.yt/*",
    "tabs",
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "interaction/assets/*"
  ],
  "applications": {
    "gecko": {
      "id": "tempid@2ch.helper"
    }
  }
}