Examine source code of Manga Comments Companion

{
  "manifest_version": 2,
  "name": "wxt-react-starter",
  "description": "manifest.json description",
  "version": "0.0.8",
  "icons": {
    "16": "icon/16.png",
    "32": "icon/32.png",
    "48": "icon/48.png",
    "96": "icon/96.png",
    "128": "icon/128.png"
  },
  "permissions": [
    "storage",
    "alarms",
    "activeTab",
    "http://localhost:8080/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "extension.moz@mangacomments.com",
      "data_collection_permissions": {
        "required": [
          "browsingActivity"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Default Popup Title",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.arvencomics.com/*",
        "*://*.asmotoon.com/*",
        "*://*.asuracomic.net/*",
        "*://*.athreascans.com/*",
        "*://*.atsumoe.com/*",
        "*://*.bato.to/*",
        "*://*.brainrotcomics.com/*",
        "*://*.comix.to/*",
        "*://*.demonicscans.org/*",
        "*://*.divatoon.com/*",
        "*://*.elftoon.com/*",
        "*://*.en-thunderscans.com/*",
        "*://*.evascans.org/*",
        "*://*.falconscans.com/*",
        "*://*.fanfox.net/*",
        "*://*.firescans.xyz/*",
        "*://*.flamecomics.xyz/*",
        "*://*.gdscans.com/*",
        "*://*.greedscans.com/*",
        "*://*.hadesscans.com/*",
        "*://*.kaliscan.com/*",
        "*://*.kappabeast.com/*",
        "*://*.kencomics.com/*",
        "*://*.ksgroupscans.com/*",
        "*://*.kuramanga.com/*",
        "*://*.lagoonscans.com/*",
        "*://*.lhtranslation.net/*",
        "*://*.likemanga.io/*",
        "*://*.luacomic.org/*",
        "*://*.madarascans.com/*",
        "*://*.magustoon.org/*",
        "*://*.manga.madokami.al/*",
        "*://*.mangacloud.org/*",
        "*://*.mangadex.org/*",
        "*://*.mangafire.to/*",
        "*://*.mangago.zone/*",
        "*://*.mangahere.cc/*",
        "*://*.mangakakalot.gg/*",
        "*://*.mangakatana.com/*",
        "*://*.mangaloom.com/*",
        "*://*.manganato.gg/*",
        "*://*.mangapark.io/*",
        "*://*.mangapark.net/*",
        "*://*.mangaread.org/*",
        "*://*.mangareader.to/*",
        "*://*.mangasushi.org/*",
        "*://*.mangataro.org/*",
        "*://*.mangatown.com/*",
        "*://*.mangaupdates.com/*",
        "*://*.mangayy.org/*",
        "*://*.manhuaplus.top/*",
        "*://*.manhuatop.org/*",
        "*://*.manhuaus.com/*",
        "*://*.mgeko.cc/*",
        "*://*.mistscans.com/*",
        "*://*.natomanga.com/*",
        "*://*.nelomanga.net/*",
        "*://*.novelcool.com/*",
        "*://*.philiascans.org/*",
        "*://*.projectsuki.com/*",
        "*://*.qiscans.org/*",
        "*://*.ragescans.com/*",
        "*://*.ravenscans.org/*",
        "*://*.rdscans.com/*",
        "*://*.ritharscans.com/*",
        "*://*.rizzfables.com/*",
        "*://*.rokaricomics.com/*",
        "*://*.silentquill.net/*",
        "*://*.spiderscans.xyz/*",
        "*://*.stonescape.xyz/*",
        "*://*.templetoons.com/*",
        "*://*.utoon.net/*",
        "*://*.violetscans.org/*",
        "*://*.vortexscans.org/*",
        "*://*.webtoons.com/*",
        "*://*.weebcentral.com/*",
        "*://*.weebdex.org/*",
        "*://*.witchscans.com/*",
        "*://*.writerscans.com/*",
        "*://*.ww2.mangafreak.me/*",
        "*://*.yakshacomics.com/*",
        "*://*.yakshascans.com/*"
      ],
      "run_at": "document_idle",
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}