Reddit 403 temp fix for "Your request has been blocked by network security. Please try to login with your Reddit account" (violentmonkey fix)

script.js

// ==UserScript==
// @name         Reddit 403 Auto-Refresh Fix (SPA-aware)
// @match        https://www.reddit.com/*
// @run-at       document-start
// @grant        none
// ==/UserScript==

(function() {
    let fetchPatched = false;

    function patchFetch() {
        if (fetchPatched) return;
        fetchPatched = true;

        const origFetch = window.fetch;

        window.fetch = async function(...args) {
            const url = args[0];

            // Detect the failing Shreddit endpoint
            if (typeof url === "string" && url.includes("/svc/shreddit/comments/")) {
                const response = await origFetch(...args);

                if (response.status === 403) {
                    if (!sessionStorage.getItem("shreddit-refreshed")) {
                        sessionStorage.setItem("shreddit-refreshed", "1");
                        location.reload();
                    }
                }

                return response;
            }

            return origFetch(...args);
        };
    }

    // Patch immediately on first load
    patchFetch();

    // Detect SPA navigations (Chromium Navigation API)
    if (window.navigation && navigation.addEventListener) {
        navigation.addEventListener("navigate", (event) => {
            // Reset refresh flag on real navigations
            sessionStorage.removeItem("shreddit-refreshed");

            // Re-patch fetch after SPA navigation
            fetchPatched = false;
            patchFetch();
        });
    }

})();