diff --git a/background/token-manager.js b/background/token-manager.js
index 4aac046a..67cefe51 100644
--- a/background/token-manager.js
+++ b/background/token-manager.js
@@ -1,4 +1,4 @@
-/* global FIREFOX */// toolbox.js
+/* global FIREFOX getActiveTab waitForTabUrl */// toolbox.js
 /* global chromeLocal */// storage-util.js
 'use strict';
 
@@ -51,6 +51,8 @@ const tokenMan = (() => {
   };
   const NETWORK_LATENCY = 30; // seconds
 
+  let alwaysUseTab = FIREFOX ? false : null;
+
   return {
 
     buildKeys(name) {
@@ -138,11 +140,20 @@ const tokenMan = (() => {
     if (provider.authQuery) {
       Object.assign(query, provider.authQuery);
     }
+    if (alwaysUseTab == null) {
+      alwaysUseTab = await detectVivaldiWebRequestBug();
+    }
     const url = `${provider.authURL}?${new URLSearchParams(query)}`;
     const finalUrl = await webextLaunchWebAuthFlow({
       url,
+      alwaysUseTab,
       interactive,
       redirect_uri: query.redirect_uri,
+      windowOptions: {
+        state: 'normal',
+        width: Math.min(screen.width - 100, 800),
+        height: Math.min(screen.height - 100, 800),
+      },
     });
     const params = new URLSearchParams(
       provider.flow === 'token' ?
@@ -203,4 +214,28 @@ const tokenMan = (() => {
     err.code = r.status;
     throw err;
   }
+
+  async function detectVivaldiWebRequestBug() {
+    // Workaround for https://github.com/openstyles/stylus/issues/1182
+    // Note that modern Vivaldi isn't exposed in `navigator.userAgent` but it adds `extData` to tabs
+    const anyTab = await getActiveTab() || (await browser.tabs.query({}))[0];
+    if (anyTab && !anyTab.extData) {
+      return false;
+    }
+    let bugged = true;
+    const TEST_URL = chrome.runtime.getURL('manifest.json');
+    const check = ({url}) => {
+      bugged = url !== TEST_URL;
+    };
+    chrome.webRequest.onBeforeRequest.addListener(check, {urls: [TEST_URL], types: ['main_frame']});
+    const {tabs: [tab]} = await browser.windows.create({
+      type: 'popup',
+      state: 'minimized',
+      url: TEST_URL,
+    });
+    await waitForTabUrl(tab);
+    chrome.windows.remove(tab.windowId);
+    chrome.webRequest.onBeforeRequest.removeListener(check);
+    return bugged;
+  }
 })();
diff --git a/js/toolbox.js b/js/toolbox.js
index 7c4eb442..8307aea8 100644
--- a/js/toolbox.js
+++ b/js/toolbox.js
@@ -18,6 +18,7 @@
   stringAsRegExp
   tryCatch
   tryRegExp
+  waitForTabUrl
 */
 
 const CHROME = Boolean(chrome.app) && parseInt(navigator.userAgent.match(/Chrom\w+\/(\d+)|$/)[1]);
@@ -469,6 +470,20 @@ async function closeCurrentTab() {
   if (tab) chrome.tabs.remove(tab.id);
 }
 
+function waitForTabUrl(tab) {
+  return new Promise(resolve => {
+    browser.tabs.onUpdated.addListener(...[
+      function onUpdated(tabId, info, updatedTab) {
+        if (info.url && tabId === tab.id) {
+          browser.tabs.onUpdated.removeListener(onUpdated);
+          resolve(updatedTab);
+        }
+      },
+      ...'UpdateFilter' in browser.tabs ? [{tabId: tab.id}] : [], // FF only
+    ]);
+  });
+}
+
 function capitalize(s) {
   return s[0].toUpperCase() + s.slice(1);
 }
diff --git a/popup/preinit.js b/popup/preinit.js
index b70dd546..750f0d37 100644
--- a/popup/preinit.js
+++ b/popup/preinit.js
@@ -1,5 +1,5 @@
 /* global API */// msg.js
-/* global URLS */// toolbox.js
+/* global URLS waitForTabUrl */// toolbox.js
 'use strict';
 
 const ABOUT_BLANK = 'about:blank';
@@ -7,7 +7,7 @@ const ABOUT_BLANK = 'about:blank';
 const preinit = (async () => {
   let [tab] = await browser.tabs.query({currentWindow: true, active: true});
   if (!chrome.app && tab.status === 'loading' && tab.url === ABOUT_BLANK) {
-    tab = await waitForTabUrlFF(tab);
+    tab = await waitForTabUrl(tab);
   }
   const frames = sortTabFrames(await browser.webNavigation.getAllFrames({tabId: tab.id}));
   let url = tab.pendingUrl || tab.url || ''; // new Chrome uses pendingUrl while connecting
@@ -60,18 +60,3 @@ function sortTabFrames(frames) {
   }
   return sortedFrames;
 }
-
-function waitForTabUrlFF(tab) {
-  return new Promise(resolve => {
-    browser.tabs.onUpdated.addListener(...[
-      function onUpdated(tabId, info, updatedTab) {
-        if (info.url && tabId === tab.id) {
-          browser.tabs.onUpdated.removeListener(onUpdated);
-          resolve(updatedTab);
-        }
-      },
-      ...'UpdateFilter' in browser.tabs ? [{tabId: tab.id}] : [],
-      // TODO: remove both spreads and tabId check when strict_min_version >= 61
-    ]);
-  });
-}