diff --git a/package.json b/package.json
index 3a68788fd1..bab104e316 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "playwright": {
     "chromium_revision": "724623",
     "firefox_revision": "1009",
-    "webkit_revision": "1055"
+    "webkit_revision": "1059"
   },
   "scripts": {
     "unit": "node test/test.js",
diff --git a/src/webkit/wkExecutionContext.ts b/src/webkit/wkExecutionContext.ts
index ba5b4798f8..1e843cb842 100644
--- a/src/webkit/wkExecutionContext.ts
+++ b/src/webkit/wkExecutionContext.ts
@@ -30,7 +30,7 @@ export class WKExecutionContext implements js.ExecutionContextDelegate {
   _contextId: number;
   private _contextDestroyedCallback: () => void;
   private _executionContextDestroyedPromise: Promise<unknown>;
-  _jsonObjectId: Protocol.Runtime.RemoteObjectId | undefined;
+  _jsonStringifyObjectId: Protocol.Runtime.RemoteObjectId | undefined;
 
   constructor(client: WKTargetSession, contextPayload: Protocol.Runtime.ExecutionContextDescription) {
     this._session = client;
@@ -219,9 +219,9 @@ export class WKExecutionContext implements js.ExecutionContextDelegate {
   }
 
   private _returnObjectByValue(objectId: Protocol.Runtime.RemoteObjectId) {
-    const serializeFunction = function(JSON: { stringify: (o: any) => string }) {
+    const serializeFunction = function(stringify: (o: any) => string) {
       try {
-        return JSON.stringify(this);
+        return stringify(this);
       } catch (e) {
         if (e instanceof TypeError)
           return void 0;
@@ -232,7 +232,7 @@ export class WKExecutionContext implements js.ExecutionContextDelegate {
       // Serialize object using standard JSON implementation to correctly pass 'undefined'.
       functionDeclaration: serializeFunction + '\n' + suffix + '\n',
       objectId: objectId,
-      arguments: [ { objectId: this._jsonObjectId } ],
+      arguments: [ { objectId: this._jsonStringifyObjectId } ],
       returnByValue: true
     }).catch(e => {
       if (isSwappedOutError(e))
diff --git a/src/webkit/wkPage.ts b/src/webkit/wkPage.ts
index df8bddbbcd..315aa8eaea 100644
--- a/src/webkit/wkPage.ts
+++ b/src/webkit/wkPage.ts
@@ -37,7 +37,7 @@ import { PNG } from 'pngjs';
 const UTILITY_WORLD_NAME = '__playwright_utility_world__';
 const BINDING_CALL_MESSAGE = '__playwright_binding_call__';
 const JSON_CALL_MESSAGE = '__playwright_json_call__';
-const JSON_SAVE_SCRIPT = `console.debug('${JSON_CALL_MESSAGE}', JSON)`;
+const JSON_SAVE_SCRIPT = `console.debug('${JSON_CALL_MESSAGE}', JSON.stringify.bind(JSON))`;
 
 export class WKPage implements PageDelegate {
   readonly rawMouse: RawMouseImpl;
@@ -101,7 +101,7 @@ export class WKPage implements PageDelegate {
       promises.push(this._setEmulateMedia(session, this._page._state.mediaType, this._page._state.colorScheme));
     if (contextOptions.javaScriptEnabled === false)
       promises.push(session.send('Emulation.setJavaScriptEnabled', { enabled: false }));
-    if (this._setBootstrapScripts.length && session.isProvisional())
+    if (session.isProvisional())
       promises.push(this._setBootstrapScripts(session));
     if (contextOptions.bypassCSP)
       promises.push(session.send('Page.setBypassCSP', { enabled: true }));
@@ -109,9 +109,8 @@ export class WKPage implements PageDelegate {
       promises.push(this._setExtraHTTPHeaders(session, this._page._state.extraHTTPHeaders));
     if (this._page._state.viewport)
       promises.push(WKPage._setViewport(session, this._page._state.viewport));
-    if (contextOptions.javaScriptEnabled !== false)
-      promises.push(session.send('Page.setBootstrapScript', { source: JSON_SAVE_SCRIPT }));
     await Promise.all(promises);
+    await this._page.evaluate(JSON_SAVE_SCRIPT);
   }
 
   didClose() {
@@ -224,7 +223,7 @@ export class WKPage implements PageDelegate {
     if (level === 'debug' && parameters && parameters[0].value === JSON_CALL_MESSAGE) {
       const parsedObjectId = JSON.parse(parameters[1].objectId);
       const context = this._contextIdToContext.get(parsedObjectId.injectedScriptId);
-      (context._delegate as WKExecutionContext)._jsonObjectId = parameters[1].objectId;
+      (context._delegate as WKExecutionContext)._jsonStringifyObjectId = parameters[1].objectId;
       return;
     }
     let derivedType: string = type;
@@ -308,7 +307,7 @@ export class WKPage implements PageDelegate {
       throw new Error('Not implemented');
     const width = viewport.width;
     const height = viewport.height;
-    await session.send('Emulation.setDeviceMetricsOverride', { width, height, deviceScaleFactor: viewport.deviceScaleFactor || 1 });
+    await session.send('Emulation.setDeviceMetricsOverride', { width, height, fixedLayout: false, deviceScaleFactor: viewport.deviceScaleFactor || 1 });
   }
 
   setCacheEnabled(enabled: boolean): Promise<void> {
@@ -392,7 +391,7 @@ export class WKPage implements PageDelegate {
   }
 
   async resetViewport(oldSize: types.Size): Promise<void> {
-    await this._session.send('Emulation.setDeviceMetricsOverride', { ...oldSize, deviceScaleFactor: 0 });
+    await this._session.send('Emulation.setDeviceMetricsOverride', { ...oldSize, fixedLayout: false, deviceScaleFactor: 0 });
   }
 
   async getContentFrame(handle: dom.ElementHandle): Promise<frames.Frame | null> {