Save as MHTML (MIME HTML)

manifest.json

{
  "version": "0.1.5",
  "manifest_version": 3,
  "offline_enabled": true,
  "name": "Save as MHTML (MIME HTML)",
  "homepage_url": "https://mybrowseraddon.com/save-as-mhtml.html",
  "description": "Save a page content & incorporate all resources (i.e. images) in a single file!",
  "commands": {
    "_execute_action": {}
  },
  "background": {
    "service_worker": "background.js"
  },
  "permissions": [
    "storage",
    "downloads",
    "activeTab",
    "pageCapture",
    "contextMenus"
  ],
  "action": {
    "default_title": "Save as MHTML (MIME HTML)",
    "default_icon": {
      "16": "data/icons/16.png",
      "32": "data/icons/32.png",
      "48": "data/icons/48.png",
      "64": "data/icons/64.png"
    }
  },
  "icons": {
    "16": "data/icons/16.png",
    "32": "data/icons/32.png",
    "48": "data/icons/48.png",
    "64": "data/icons/64.png",
    "128": "data/icons/128.png"
  },
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}