diff --git a/packages/playwright/src/common/ipc.ts b/packages/playwright/src/common/ipc.ts
index 3310b46b3a..17b1056a78 100644
--- a/packages/playwright/src/common/ipc.ts
+++ b/packages/playwright/src/common/ipc.ts
@@ -33,7 +33,7 @@ export type ConfigCLIOverrides = {
   timeout?: number;
   ignoreSnapshots?: boolean;
   updateSnapshots?: 'all'|'none'|'missing';
-  workers?: number;
+  workers?: number | string;
   projects?: { name: string, use?: any }[],
   use?: any;
 };
diff --git a/packages/trace-viewer/src/ui/actionList.css b/packages/trace-viewer/src/ui/actionList.css
index ad5cee5780..10e3c39f98 100644
--- a/packages/trace-viewer/src/ui/actionList.css
+++ b/packages/trace-viewer/src/ui/actionList.css
@@ -15,12 +15,24 @@
 */
 
 .action-title {
-  flex: auto;
   display: block;
   overflow: hidden;
   text-overflow: ellipsis;
 }
 
+.action-location {
+  display: flex;
+  flex: none;
+  margin: 0 4px;
+  color: var(--vscode-foreground);
+}
+
+.action-location > span {
+  margin: 0 4px;
+  cursor: pointer;
+  text-decoration: underline;
+}
+
 .action-duration {
   display: flex;
   flex: none;
diff --git a/packages/trace-viewer/src/ui/actionList.tsx b/packages/trace-viewer/src/ui/actionList.tsx
index 1f5b06709f..a0f239b712 100644
--- a/packages/trace-viewer/src/ui/actionList.tsx
+++ b/packages/trace-viewer/src/ui/actionList.tsx
@@ -72,17 +72,21 @@ export const ActionList: React.FC<ActionListProps> = ({
       onAccepted={item => setSelectedTime({ minimum: item.action!.startTime, maximum: item.action!.endTime })}
       isError={item => !!item.action?.error?.message}
       isVisible={item => !selectedTime || (item.action!.startTime <= selectedTime.maximum && item.action!.endTime >= selectedTime.minimum)}
-      render={item => renderAction(item.action!, sdkLanguage, revealConsole, isLive || false)}
+      render={item => renderAction(item.action!, { sdkLanguage, revealConsole, isLive, showDuration: true, showBadges: true })}
     />
   </div>;
 };
 
 export const renderAction = (
   action: ActionTraceEvent,
-  sdkLanguage?: Language,
-  revealConsole?: () => void,
-  isLive?: boolean,
-) => {
+  options: {
+    sdkLanguage?: Language,
+    revealConsole?: () => void,
+    isLive?: boolean,
+    showDuration?: boolean,
+    showBadges?: boolean,
+  }) => {
+  const { sdkLanguage, revealConsole, isLive, showDuration, showBadges } = options;
   const { errors, warnings } = modelUtil.stats(action);
   const locator = action.params.selector ? asLocator(sdkLanguage || 'javascript', action.params.selector, false /* isFrameLocator */, true /* playSafe */) : undefined;
 
@@ -99,10 +103,11 @@ export const renderAction = (
       {locator && <div className='action-selector' title={locator}>{locator}</div>}
       {action.method === 'goto' && action.params.url && <div className='action-url' title={action.params.url}>{action.params.url}</div>}
     </div>
-    <div className='action-duration' style={{ flex: 'none' }}>{time || <span className='codicon codicon-loading'></span>}</div>
-    <div className='action-icons' onClick={() => revealConsole?.()}>
+    {(showDuration || showBadges) && <div className='spacer'></div>}
+    {showDuration && <div className='action-duration'>{time || <span className='codicon codicon-loading'></span>}</div>}
+    {showBadges && <div className='action-icons' onClick={() => revealConsole?.()}>
       {!!errors && <div className='action-icon'><span className='codicon codicon-error'></span><span className="action-icon-value">{errors}</span></div>}
       {!!warnings && <div className='action-icon'><span className='codicon codicon-warning'></span><span className="action-icon-value">{warnings}</span></div>}
-    </div>
+    </div>}
   </>;
 };
diff --git a/packages/trace-viewer/src/ui/errorsTab.tsx b/packages/trace-viewer/src/ui/errorsTab.tsx
index 8025f4920c..380b02323a 100644
--- a/packages/trace-viewer/src/ui/errorsTab.tsx
+++ b/packages/trace-viewer/src/ui/errorsTab.tsx
@@ -20,8 +20,6 @@ import type * as modelUtil from './modelUtil';
 import { PlaceholderPanel } from './placeholderPanel';
 import { renderAction } from './actionList';
 import type { Language } from '@isomorphic/locatorGenerators';
-import type { Boundaries } from '../geometry';
-import { msToString } from '@web/uiUtils';
 
 type ErrorsTabModel = {
   errors: Map<string, modelUtil.ActionTraceEventInContext>;
@@ -42,17 +40,32 @@ export function useErrorsTabModel(model: modelUtil.MultiTraceModel | undefined):
 export const ErrorsTab: React.FunctionComponent<{
   errorsModel: ErrorsTabModel,
   sdkLanguage: Language,
-  boundaries: Boundaries,
-}> = ({ errorsModel, sdkLanguage, boundaries }) => {
+  revealInSource: (action: modelUtil.ActionTraceEventInContext) => void,
+}> = ({ errorsModel, sdkLanguage, revealInSource }) => {
   if (!errorsModel.errors.size)
     return <PlaceholderPanel text='No errors' />;
 
-  return <div className='fill' style={{ overflow: 'auto ' }}>
+  return <div className='fill' style={{ overflow: 'auto' }}>
     {[...errorsModel.errors.entries()].map(([message, action]) => {
+      let location: string | undefined;
+      let longLocation: string | undefined;
+      if (action.stack?.[0]) {
+        const file = action.stack[0].file.replace(/.*\/(.*)/, '$1');
+        location = file + ':' + action.stack[0].line;
+        longLocation = action.stack[0].file + ':' + action.stack[0].line;
+      }
       return <div key={message}>
-        <div className='hbox' style={{ alignItems: 'center', padding: 5 }}>
-          <div style={{ color: 'var(--vscode-editorCodeLens-foreground)', marginRight: 5 }}>{msToString(action.startTime - boundaries.minimum)}</div>
-          {renderAction(action, sdkLanguage)}
+        <div className='hbox' style={{
+          alignItems: 'center',
+          padding: '5px 10px',
+          minHeight: 36,
+          fontWeight: 'bold',
+          color: 'var(--vscode-errorForeground)',
+        }}>
+          {renderAction(action, { sdkLanguage })}
+          {location && <div className='action-location'>
+            @ <span title={longLocation} onClick={() => revealInSource(action)}>{location}</span>
+          </div>}
         </div>
         <ErrorMessage error={message} />
       </div>;
diff --git a/packages/trace-viewer/src/ui/filmStrip.tsx b/packages/trace-viewer/src/ui/filmStrip.tsx
index cbd2fb8d4f..f24a8939b0 100644
--- a/packages/trace-viewer/src/ui/filmStrip.tsx
+++ b/packages/trace-viewer/src/ui/filmStrip.tsx
@@ -55,8 +55,8 @@ export const FilmStrip: React.FunctionComponent<{
     const previewTime = boundaries.minimum + (boundaries.maximum - boundaries.minimum) * previewPoint.x / measure.width;
     previewImage = screencastFrames[upperBound(screencastFrames, previewTime, timeComparator) - 1];
     const fitInto = {
-      width: Math.min(500, (window.innerWidth / 2) | 0),
-      height: Math.min(500, (window.innerHeight / 2) | 0),
+      width: Math.min(800, (window.innerWidth / 2) | 0),
+      height: Math.min(800, (window.innerHeight / 2) | 0),
     };
     previewSize = previewImage ? inscribe({ width: previewImage.width, height: previewImage.height }, fitInto) : undefined;
   }
@@ -75,7 +75,7 @@ export const FilmStrip: React.FunctionComponent<{
         top: measure.bottom + 5,
         left: Math.min(previewPoint!.x, measure.width - (previewSize ? previewSize.width : 0) - 10),
       }}>
-        {previewPoint.action && <div className='film-strip-hover-title'>{renderAction(previewPoint.action, previewPoint.sdkLanguage)}</div>}
+        {previewPoint.action && <div className='film-strip-hover-title'>{renderAction(previewPoint.action, previewPoint)}</div>}
         {previewImage && previewSize && <div style={{ width: previewSize.width, height: previewSize.height }}>
           <img src={`sha1/${previewImage.sha1}`} width={previewSize.width} height={previewSize.height} />
         </div>}
diff --git a/packages/trace-viewer/src/ui/workbench.tsx b/packages/trace-viewer/src/ui/workbench.tsx
index 4ff57b5716..7366928f95 100644
--- a/packages/trace-viewer/src/ui/workbench.tsx
+++ b/packages/trace-viewer/src/ui/workbench.tsx
@@ -124,7 +124,10 @@ export const Workbench: React.FunctionComponent<{
     id: 'errors',
     title: 'Errors',
     errorCount: errorsModel.errors.size,
-    render: () => <ErrorsTab errorsModel={errorsModel} sdkLanguage={sdkLanguage} boundaries={boundaries} />
+    render: () => <ErrorsTab errorsModel={errorsModel} sdkLanguage={sdkLanguage} revealInSource={action => {
+      setSelectedAction(action);
+      selectPropertiesTab('source');
+    }} />
   };
   const sourceTab: TabbedPaneTabModel = {
     id: 'source',
diff --git a/packages/web/src/components/errorMessage.css b/packages/web/src/components/errorMessage.css
index 29a6a64e6d..db190dde1c 100644
--- a/packages/web/src/components/errorMessage.css
+++ b/packages/web/src/components/errorMessage.css
@@ -18,7 +18,6 @@
   font-family: var(--vscode-editor-font-family);
   font-weight: var(--vscode-editor-font-weight);
   font-size: var(--vscode-editor-font-size);
-  background-color: var(--vscode-inputValidation-errorBackground);
   white-space: pre-wrap;
   word-break: break-word;
   padding: 10px;
diff --git a/tests/playwright-test/expect.spec.ts b/tests/playwright-test/expect.spec.ts
index 29d38d7e1e..7a0df898bb 100644
--- a/tests/playwright-test/expect.spec.ts
+++ b/tests/playwright-test/expect.spec.ts
@@ -822,16 +822,16 @@ test('should chain expect matchers and expose matcher utils', async ({ runInline
 
         const log = callLogText(matcherResult?.log);
         const message = pass
-          ? () => this.utils.matcherHint('toBe', locator, expected, expectOptions) +
+          ? () => this.utils.matcherHint('toHaveAmount', undefined, undefined, expectOptions) +
               '\\n\\n' +
               \`Expected: \${this.isNot ? 'not' : ''}\${this.utils.printExpected(expected)}\\n\` +
               (matcherResult ? \`Received: \${this.utils.printReceived(matcherResult.actual)}\` : '') +
-              log
-          : () =>  this.utils.matcherHint('toBe', locator, expected, expectOptions) +
+              '\\n\\n' +log
+          : () =>  this.utils.matcherHint('toHaveAmount', undefined, undefined, expectOptions) +
               '\\n\\n' +
               \`Expected: \${this.utils.printExpected(expected)}\n\` +
               (matcherResult ? \`Received: \${this.utils.printReceived(matcherResult.actual)}\` : '') +
-              log;
+              '\\n\\n' +log;
 
         return {
           name: 'toHaveAmount',