userscripts dont run on chrome webstore

[retronbv]

(Please fill out the issue template with your details)

Expected Behavior

Userscripts can run on chrome webstore

Actual Behavior

Userscript doesnt even show in popup:

Specifications

• Vivaldi: 3.7.2218.55
• TM: 4.12
• OS: Linux

Script

(Please give an example of the script if applicable.)

// ==UserScript==
// @name         Vivaldi Web Store
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  changes chrome webstore to vivaldi webtore
// @author       retronbv
// @match        https://chrome.google.com/webstore/category/extensions
// @icon         https://img.icons8.com/fluent/344/vivaldi-web-browser.png
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var x = document.getElementsByClassName("uKSMob")[0];
    x.removeChild(x.firstElementChild);
    var y = document.createElement("img");
    y.src = "https://img.icons8.com/fluent/344/vivaldi-web-browser.png";
    y.width="32";
    x.appendChild(y);
    document.querySelectorAll(".PNF6le")[0].innerText="vivaldi web store";
    document.querySelectorAll(".SUBrWc")[0].innerText="About Vivaldi Web Store";
})();

[7nik]

TM just cannot. Changing the chrome web store pages is prohibited for all extensions for security reasons, and for chrome://* pages as well.

[retronbv]

welp, thanks for your help @7nik

[asheroto]

@7nik do you happen to know if this applies to "chrome-extension://" as well? I have an extension that I want to use a TM script on in Brave browser. I have file URIs enabled in Settings and in the Extension Options but I see the following. Thanks!

[7nik]

As you can see in MDN's Browser compatibility of schemes, chrome (and likely all chomium-based browsers) supports only http, https, ftp and file schemes (same list as on Chrome Develeopers) and there is even no chrome-extension scheme though it's listed in the possible values.
In Chromium, attempt to load an unpacked extension with access to extension's pages, even own ones, gives the error Invalid value for 'content_scripts[0].matches[0]': Invalid scheme.

[asheroto]

Thanks!