manifest.json

{
  "manifest_version": 3,
  "name": "Example Webextension",
  "version": "2.3.3",
  "author": "42null",
  "description": "An example extension",
  "homepage_url": "https://github.com/42null/Return-YouTube-UI",

  "browser_specific_settings": {
    "gecko": {
      "id": "{020ca5d0-0cfd-4bd3-82d4-d85b240d3714}"
    }
  },

  "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": [
    "*://*.example.com/",
    "*://*.example.net/",
    "*://*.example.org/",
    "*://*.example.edu/"
  ],
  "background": {
    "scripts": ["background/background.js"]//Used to trigger on install/update page
//    "service_worker": "background/background.js"
  },

  "action": {
    "default_icon": "icons/logo.svg",
    "theme_icons": [{
      "light": "icons/logo.svg",
      "dark": "icons/logo.svg",
      "size": 32
    }],
    "default_title": "Example Extension",
    "default_popup": "popup/popup.html"
  },

  "content_scripts": [
    {
      "matches": [
        "*://*.example.com/",
        "*://*.example.net/",
        "*://*.example.org/",
        "*://*.example.edu/"
      ],
      "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": [
        "*://*.example.com/",
        "*://*.example.net/",
        "*://*.example.org/",
        "*://*.example.edu/"
      ]
    }
  ],
  "icons": {
    "16": "icons/logo.svg",
    "48": "icons/logo.svg",
    "128": "icons/logo.svg",
    "512": "icons/logo.svg"
  }
}