Prevent facebook for passing fbclid params when clicking external links. Also works with right-click(new tab, new window, etc), and Enter Key.

no-fbclid.js

// ==UserScript==
// @name         NO FACEBOOK's FBCLID
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Prevent facebook for passing fbclid params when clicking external links
// @author       RZFury
// @match        https://web.facebook.com/*
// @icon         https://www.google.com/s2/favicons?domain=facebook.com
// @grant        none
// ==/UserScript==

window.onload = function() {
    document.addEventListener('click', verifyFBCLID(onClickExternalLink));
    document.addEventListener('contextmenu', verifyFBCLID(onContextMenuExternalLink, false));
    document.addEventListener('keydown', verifyFBCLID(onKeyEnterExternalLink));
}

function verifyFBCLID(callback, stopPropagation = true) {
    return (e) => {
        if(e.type == 'keydown') {
            if(e.key != 'Enter') {
                return;
            }
        }

        let targetLink = e.target;
        while(targetLink != null) {
            if(targetLink.tagName == "A") break;
            targetLink = targetLink.parentElement;
        }

        if(targetLink == null) return;

        if(targetLink.href.includes("fbclid")) {
            if(stopPropagation) {
                e.preventDefault();
                e.stopPropagation();
            }
            if(callback) {
                callback(e, targetLink);
            }
        }
    }
}

function onClickExternalLink(e, targetLink) {
    const url = new URL(targetLink.href);
    url.searchParams.delete('fbclid');

    const a = document.createElement('a');
    a.href = url.toString();
    a.target = '_blank';
    a.click();
    a.remove();
}

function onContextMenuExternalLink(e, targetLink) {
    let url;
    if(targetLink.href.includes('l.php')) {
        url = new URL(targetLink.href).searchParams.get('u');
    }

    url = new URL(url);
    url.searchParams.delete('fbclid');

    targetLink.href = url.toString();
}

function onKeyEnterExternalLink(e, targetLink) {
    let url = targetLink.href;
    if(targetLink.href.includes('l.php')) {
        url = new URL(targetLink.href).searchParams.get('u');
    }

    url = new URL(url);
    url.searchParams.delete('fbclid');

    const a = document.createElement('a');
    a.href = url.toString();
    a.target = '_blank';
    a.click();
    a.remove();
}