manifest.json

{
  "manifest_version": 3,
  "name": "Return YouTube UI",
  "version": "2.3.1",
  "author": "42null",
  "description": "An extension making YouTube look like it used to before everything became rounded and circular with customisable settings.",
  "homepage_url": "https://github.com/42null/Return-YouTube-UI",

  "browser_specific_settings": {
    "gecko": {
      "id": "{6d38b91b-577a-4e14-a402-caa8e2080ccd}"
    }
  },

  "permissions": [
    "storage",//Used to save extension prefrences
    "scripting",//Used to inject code into pages to modify them
    "tabs"//Used to open on install/updae page
  ],
  "host_permissions": [
    "*://*.youtube.com/*"
  ],
  "background": {
    "scripts": ["background/background.js"]//Used to trigger on install/update page
//    "service_worker": "background/background.js"
  },

  "action": {
    "default_icon": "icons/ReturnYouTubeUIIconV2R2_512.png",
    "theme_icons": [{
      "light": "icons/ReturnYouTubeUIIconV2R2_512.png",
      "dark": "icons/ReturnYouTubeUIIconV2R2_512.png",
      "size": 32
    }],
    "default_title": "Return YouTube UI",
    "default_popup": "popup/popup.html"
  },

  "content_scripts": [
    {
      "matches": ["*://*.youtube.com/*"],
      "js": ["triggerSetup.js", "injectionInjector.js"]
    }
  ],

  "web_accessible_resources": [
    {
      "resources": [
        "injection_parts/helper_functions.js",
        "global_helper_functions.js",
        "injectionInjector.js",
        "injection_parts/primary/*.css",
        "injection_parts/extras/*.css",
        "projectConfiguration.json",
        "icons/*"
      ],
      "matches": ["*://*.youtube.com/*"]
    }
  ],

  "icons": {
    "512": "icons/ReturnYouTubeUIIconV2R2_512.png"
  }
}