diff --git a/package.json b/package.json
index b512f631a2..2e210ec2d4 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "playwright": {
     "chromium_revision": "740847",
     "firefox_revision": "1028",
-    "webkit_revision": "1146"
+    "webkit_revision": "1147"
   },
   "scripts": {
     "ctest": "cross-env BROWSER=chromium node test/test.js",
diff --git a/src/webkit/wkConnection.ts b/src/webkit/wkConnection.ts
index 1a557d5596..878b0677d5 100644
--- a/src/webkit/wkConnection.ts
+++ b/src/webkit/wkConnection.ts
@@ -166,7 +166,7 @@ export class WKSession extends platform.EventEmitter {
 export function createProtocolError(error: Error, method: string, object: { error: { message: string; data: any; }; }): Error {
   let message = `Protocol error (${method}): ${object.error.message}`;
   if ('data' in object.error)
-    message += ` ${object.error.data}`;
+    message += ` ${JSON.stringify(object.error.data)}`;
   return rewriteError(error, message);
 }
 
diff --git a/src/webkit/wkPage.ts b/src/webkit/wkPage.ts
index 4ce2f353af..2e517a4c00 100644
--- a/src/webkit/wkPage.ts
+++ b/src/webkit/wkPage.ts
@@ -146,6 +146,10 @@ export class WKPage implements PageDelegate {
       promises.push(session.send('Network.setExtraHTTPHeaders', { headers: this._page._state.extraHTTPHeaders }));
     if (this._page._state.hasTouch)
       promises.push(session.send('Page.setTouchEmulationEnabled', { enabled: true }));
+    if (contextOptions.timezoneId) {
+      promises.push(session.send('Page.setTimeZone', { timeZone: contextOptions.timezoneId }).
+          catch(e => { throw new Error(`Invalid timezone ID: ${contextOptions.timezoneId}`); }));
+    }
     await Promise.all(promises);
   }
 
diff --git a/test/emulation.spec.js b/test/emulation.spec.js
index 2aef30efcb..712f64cad0 100644
--- a/test/emulation.spec.js
+++ b/test/emulation.spec.js
@@ -193,24 +193,36 @@ module.exports.describe = function({testRunner, expect, playwright, headless, FF
     });
   });
 
-  describe.skip(FFOX || WEBKIT)('BrowserContext({timezoneId})', function() {
+  describe.skip(FFOX)('BrowserContext({timezoneId})', function() {
     it('should work', async ({ newPage }) => {
       const func = () => new Date(1479579154987).toString();
       {
         const page = await newPage({ timezoneId: 'America/Jamaica' });
-        expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
+        if (WEBKIT)
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 13:12:34 GMT-0500 (America/Jamaica)');
+        else
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 13:12:34 GMT-0500 (Eastern Standard Time)');
       }
       {
         const page = await newPage({ timezoneId: 'Pacific/Honolulu' });
-        expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 08:12:34 GMT-1000 (Hawaii-Aleutian Standard Time)');
+        if (WEBKIT)
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 08:12:34 GMT-1000 (Pacific/Honolulu)');
+        else
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 08:12:34 GMT-1000 (Hawaii-Aleutian Standard Time)');
       }
       {
         const page = await newPage({ timezoneId: 'America/Buenos_Aires' });
-        expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 15:12:34 GMT-0300 (Argentina Standard Time)');
+        if (WEBKIT)
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 15:12:34 GMT-0300 (America/Buenos_Aires)');
+        else
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 15:12:34 GMT-0300 (Argentina Standard Time)');
       }
       {
         const page = await newPage({ timezoneId: 'Europe/Berlin' });
-        expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 19:12:34 GMT+0100 (Central European Standard Time)');
+        if (WEBKIT)
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 19:12:34 GMT+0100 (Europe/Berlin)');
+        else
+          expect(await page.evaluate(func)).toBe('Sat Nov 19 2016 19:12:34 GMT+0100 (Central European Standard Time)');
       }
     });