Customize new tab

Make browsers that cannot set a new tab page support customizing the new tab page.

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manifest.json

{
  "action": {
    "default_icon": {
      "16": "icons/Tab16.png",
      "32": "icons/Tab32.png"
    },
    "default_popup": "files/popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "files/index.html"
  },
  "default_locale": "en",
  "description": "__MSG_extdesc__",
  "icons": {
    "16": "icons/Tab16.png",
    "32": "icons/Tab32.png",
    "48": "icons/Tab48.png",
    "128": "icons/Tab128.png"
  },
  "incognito": "split",
  "manifest_version": 3,
  "name": "__MSG_extname__",
  "options_ui": {
    "open_in_tab": false,
    "page": "files/popup.html"
  },
  "permissions": [
    "storage"
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx",
  "version": "1.2"
}