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AccountSwapper/background.js

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+const cookieDomain = ".backend.wplace.live";
+
+async function preserveAndResetJ() {
+    let savedValue = null;
+
+    try {
+        const oldJ = await chrome.cookies.get({
+            url: "https://backend.wplace.live/",
+            name: "j"
+        });
+
+        if (oldJ && oldJ.value) {
+            savedValue = oldJ.value;
+            console.log("[bg] Saved j cookie:", savedValue);
+        } else {
+            console.warn("[bg] No 'j' cookie found → will only nuke cf_clearance");
+        }
+
+        setTimeout(async () => {
+            await new Promise((resolve) => {
+                chrome.browsingData.remove(
+                    { origins: ["https://wplace.live"] },
+                    { cookies: true },
+                    () => {
+                        console.log("[bg] Nuke done (delayed)");
+                        resolve();
+                    }
+                );
+            });
+
+            if (savedValue) {
+                setCookie(savedValue);
+            } else {
+                console.log("[bg] No j to restore, leaving nuked");
+            }
+        }, 2000);
+
+    } catch (err) {
+        console.error("[bg] Error in preserveAndResetJ:", err);
+    }
+}
+
+chrome.webNavigation.onCompleted.addListener((details) => {
+    if (details.url.includes("wplace.live")) {
+        console.log("[bg] Page load detected → nuking cookies with double pass");
+        preserveAndResetJ();
+    }
+}, { url: [{ hostContains: "wplace.live" }] });
+
+function setCookie(value) {
+    const cleaned = value.trim();
+    console.log("[bg] setCookie CALLED with:", cleaned);
+
+    chrome.cookies.set({
+        url: "https://backend.wplace.live/",
+        name: "j",
+        value: cleaned,
+        domain: cookieDomain,
+        path: "/"
+    }, (cookie) => {
+        if (chrome.runtime.lastError) {
+            console.error("[bg] cookie set error:", chrome.runtime.lastError.message);
+        } else {
+            console.log("[bg] cookie set result:", cookie);
+
+            chrome.tabs.query({ active: true, currentWindow: true }, (tabs) => {
+                if (tabs.length > 0) {
+                    chrome.tabs.sendMessage(tabs[0].id, {
+                        type: "cookieSet",
+                        value: cleaned
+                    });
+                }
+            });
+        }
+    });
+}
+
+chrome.runtime.onMessage.addListener(async (msg, sender, sendResponse) => {
+    if (msg.type === "setCookie" && msg.value) {
+        await setCookie(msg.value);
+        sendResponse({ status: "ok" });
+    }
+    return true;
+});

AccountSwapper/content.js

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+window.addEventListener('message', (event) => {
+    if (event.source !== window) return;
+    if (event.data.source !== 'my-userscript') return;
+
+    const message = event.data;
+    if (message.type === 'setCookie' && message.value) {
+        chrome.runtime.sendMessage({
+            type: "setCookie",
+            value: message.value
+        }, (response) => {
+            if (response?.status === "ok") {
+                console.log("✅ Forwarded token to background.");
+            }
+        });
+    }
+});
+
+chrome.runtime.onMessage.addListener((msg) => {
+    if (msg.type === "cookieSet") {
+        window.postMessage({
+            source: "my-extension",
+            type: "cookieSet",
+            value: msg.value
+        }, "*");
+    }
+});