Hi, My app is using JavascriptCore to run the business logic in a javascript environment. We are randomly seeing crashes when users move the app back to the foreground. These crashes are reported by Firebase (I am attaching an example). I also tried to find them in Organizer, but the stacktraces don't match and I am not sure if they are pointing to the same error (I attach one just in case). I was trying to investigate a little bit about this, but I could find any explanation about what pas_reallocation_did_fail would mean. Here is our implementation: -(void) enqueueCallback:(JSValue *)callback withArguments:(NSArray *)args exclusive:(BOOL)exclusive { [self enqueueBlock:^{ @autoreleasepool { [callback callWithArguments:args]; } } exclusive:exclusive]; } Basically, every JS block is enqueued and then run by a dedicated thread specific to our JSContext. Can I get some help? Thanks in advance! Crashlytics.txt 2024-08-30_10-00-01.2572_-0400-f757f8306eda9679ec1b2ff90fbc66c4eb1fbee7.crash

I recently upgraded my device from IOS 18.4 to IOS 26. My web extension has disapeared from safari. I can see it in Settings > Apps > Safari > Extensions and when I turn it on and re-open safari. I just get a mesasge that says "{extension name} is no longer avaiable". I have tried Manifest V2 and Manifest V3 both yield the same results. The current production extension bundled with the IOS app has the same problem. I can no longer use or test my own extension !? Help please !

Hi, in our app we have a WKWebView with complex web content that is loaded with cachePolicy: .reloadIgnoringLocalCacheData. If the app is in the background for several hours and returns in the foreground we noticed that the system reloads the webpage, but it does so with a cachePoliy returnCacheDataElseLoad. This could break the app if older cache content is present. To reproduce start an app in the simulator (tested with iOS 17.2), put it in the background and via activity monitor stop the processes com.apple.Webkit.WebContent com.apple.Webkit.networking After foreground the reload will happen. Two questions: why is this reload happening after some hours in the background? We haven't seen any crash reports related to this. It mostly happens on one of our test devices (iphone13 with iOS17.2.1). why is the webview reloading with a modified cachePolicy (returnCacheDataElseLoad)? Our temporary fix is to detect this case in "webView:decidePolicyFor navigationAction decisionHandler", cancel the request and reload with modified cachePolicy. Any ideas? Thanks, Heiko Sample code: class ViewController: UIViewController, WKNavigationDelegate, WKUIDelegate { var webView: WKWebView! override func viewDidLoad() { super.viewDidLoad() let config = WKWebViewConfiguration() webView = WKWebView(frame: .zero, configuration: config) webView.uiDelegate = self webView.navigationDelegate = self view.addSubview(webView) let myRequest = URLRequest(url: URL(string: "https://www.apple.com")!, cachePolicy: .reloadIgnoringLocalCacheData) print("request \(myRequest)") webView.load(myRequest) } func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) { print("start loading \(String(describing: navigationAction.request.url)), cache:\(navigationAction.request.cachePolicy)") decisionHandler(.allow) } override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() let fullscreen = CGRect.init(x: 0, y: 0, width: view.frame.size.width, height: view.frame.size.height) webView.frame = fullscreen } }

Hello - we have a Mac application that uses a browser extension and the web extension JS APIs to communicate with Safari. As of macOS 15.4 / Safari 18.4 the tab OnAttached and tab onDetached events are no longer received. After some testing we verified that the events were working properly as of macOS 15.3 / Safari 18.3 but appear to have been broken in macOS 15.4. Note a similar issue was reported previously for Safari 17.6 and was fixed in macOS 15.0 (FB14324177). We have made a TestFlight version of our app (Tabby) available to simplify debugging via https://testflight.apple.com/join/Va8Zdv9d. To reproduce the issue: Install the Tabby TestFlight build on macOS 15.4 or 15.4.1 Open Safari, go to Safari settings and select the Extensions tab Enable the Tabby extension and grant permissions to all windows all the time Open a Safari window with at least 3 tabs Note the open window and tabs displayed in Tabby In Safari, perform a tab detach by dragging a tab out of the window Expected behavior Within Safari the detached tab should now be in it’s own window, and via the onDetached event Tabby should update to show the tab in it’s own window AND removed from the original window. Observed Safari fails to send the onDetached event and Tabby will continue to display the detached tab in its original window in addition to the new window. You can also use the repro steps above to observe the onDetached event being received or not by Tabby in the Safari developer console. The same steps but re-attaching the tab to the original window can be used to observe the onAttached event being received or not. We’ve attached two screen recordings to the Feedback ID below, one showing the events working on macOS 15.3, and one showing the events failing to be received on macOS 15.4.1. Note it also fails on macOS 15.4. FEEDBACK ID: FB17367977

I use WKWebView to display a webpage that requires authentication through an authentication provider. This works as expected, but when I close and reopen the app, I have to reauthenticate. However, if I open the same page in Safari, I only have to authenticate once. If I close Safari and reopen it, the page displays without prompting me to authenticate again. I see some cookies stored in httpCookieStore, so I assume that storing cookies works. Does anyone have an idea why authentication is not persistent between app launches? Thanks in advance. Best regards, Marc

Is it possible to open the native app from a web extension? I have tried creating a new tab that uses the app's URL scheme but the UI asking the user to open the app is not shown until the new page UI is dismissed. Creating a tab with an HTTPS URL that the app is setup to handle does not work and always the link in a new tab. I tried sending a message to the app extension and using NSExtensionContext.open(_:completionHandler:) but the URL is not opened and the closure received false, indicating it was not handled. Having the option to link back to the native app would be very useful.

Our app, VitalSource Bookshelf, is an EPUB reader that uses a WKWebView to display book content. The EPUB content format is XHTML and uses namespaces (for the epub:type declaration). On beta 4, the webkit process repeatedly crashes when loading our content. The crash appears to be in the XML parser. Here's what's at the top of the stack trace: 0 WebCore 0x19166a878 WebCore::XMLDocumentParser::startElementNs(unsigned char const*, unsigned char const*, unsigned char const*, int, unsigned char const**, int, int, unsigned char const**) + 4968 1 libxml2.2.dylib 0x19c5a2bd0 xmlParseStartTag2 + 3940 2 libxml2.2.dylib 0x19c59e730 xmlParseTryOrFinish + 2984 3 libxml2.2.dylib 0x19c59d8e4 xmlParseChunk + 708 4 WebCore 0x191668ec8 WebCore::XMLDocumentParser::doWrite(WTF::String const&) + 636 5 WebCore 0x191665b78 WebCore::XMLDocumentParser::append(WTF::RefPtr<WTF::StringImpl, WTF::RawPtrTraits<WTF::StringImpl>, WTF::DefaultRefDerefTraits<WTF::StringImpl>>&&) + 304 6 WebCore 0x190105db0 WebCore::DecodedDataDocumentParser::appendBytes(WebCore::DocumentWriter&, std::__1::span<unsigned char const, 18446744073709551615ul>) + 268 7 WebCore 0x190861c3c WebCore::DocumentLoader::commitData(WebCore::SharedBuffer const&) + 1488 8 WebKit 0x18e07ca3c WebKit::WebLocalFrameLoaderClient::committedLoad(WebCore::DocumentLoader*, WebCore::SharedBuffer const&) + 52 9 WebCore 0x190869db4 WebCore::DocumentLoader::commitLoad(WebCore::SharedBuffer const&) + 228 10 WebCore 0x1909521e4 WebCore::CachedRawResource::notifyClientsDataWasReceived(WebCore::SharedBuffer const&) + 268 I was able to reproduce this in Safari on beta 4 just by opening the following trivial xhtml file from the file system - it does the same thing it does in our app, which is reloads and crashes several times, followed by the "A problem repeatedly occurred with..." error message. <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" epub:prefix="vst: http://vitalsource.com/"><head></head><body class="dash" epub:type="chapter" data-begin-o="0" data-begin-o2="0" data-begin-o3="0" data-o="0" id="eid1844" data-end-o="14703" data-end-o2="14703" data-end-o3="14703"><h2 class="title" data-o="0" id="eid1845" data-out="33"><span class="label" data-o="0" id="eid1846"><span class="label-inner"><b data-o="0" id="eid1847">CHAPTER X</b> </span></span>THE SUBMARINE COAL-MINES</h2></body></html> I've also filed a feedback. But posting here just to raise the visibility - this is critical for us. I think it was introduced in beta 4; that's at least when we first noticed it. It was working in the earlier betas, I just don't remember if I tried beta 3 or not. It happens on iOS, macOS, and iPadOS. This has never been a problem in any earlier release of macOS / iOS.

Hi everyone, I’m encountering a critical reliability issue with message passing in my Safari Web Extension on iOS 18.4.1 and iOS 18.5. In my extension, I’m using the standard messaging API. The background script sends a message to the content script using browser.tabs.sendMessage(...), and the content script registers a listener via: browser.runtime.onMessage.addListener(handler); This setup has been working reliably in all prior versions of iOS. However, after updating to iOS 18.4.1 and 18.5, I’ve noticed the following behavior: ✅ The content script is successfully injected, and onMessage.addListener is registered (I see logging confirming this). ✅ The background script sends the message using the correct tabId (also confirmed via logs). ❌ The content script’s onMessage listener is not consistently triggered. ⚠️ This issue is intermittent, sometimes the message is received, sometimes it is silently dropped. ❌ No exceptions or errors are thrown in either script, the message appears to be sent, but not picked up from the content script message listener.

I'm working on a regular website, in which I'm trying to debug using the (MacOS) Safari Development tools. Since updating my Simulator to iOS 16.4, console.log is no longer displayed in the Console. Even when executing it directly in the console (console.log('test');), it's not printed. Now, I've read that this is a feature for debugging in-app browser content (https://webkit.org/blog/13936/enabling-the-inspection-of-web-content-in-apps/) but can't find the regular web workaround here. TL;DR: No longer see console.log in iOS 16.4 Safari when debugging from my Mac. Thanks in advance for your suggestions!

Hi, I have an app that uses WKWebView and it's crashing on iOS 26 Simulator in places I've never had problems before. In this case it's crashing when calling WKWebView.callAsyncJavaScript, but in my other project WKWebView is crashing with some sort of EXC_BAD_ACCESS other than callAsyncJavaScript. Am I missing something? Thanks,

On iOS 18, when setting the src attribute of an tag to a custom scheme (e.g., myapp://image.png) or an HTTP URL (http://example.com/image.png), if crossorigin="anonymous" is applied, the image fails to load. Additionally, images affected by this issue cannot be drawn to a , as the browser treats them as tainted and blocks access to their pixel data. This issue did not occur in previous iOS versions and seems to be a regression in iOS 18. Steps to Reproduce: Open an HTTPS-hosted H5 page in Safari on iOS 18. Add an tag with crossorigin="anonymous" and set src to either: A custom scheme: <img src="myapp://image.png" crossorigin="anonymous"> An HTTP URL (even from the same origin): <img src="http://example.com/image.png" crossorigin="anonymous"> Observe that the image does not load. Attempt to draw the image onto a and retrieve its data: const canvas = document.createElement("canvas"); const ctx = canvas.getContext("2d"); const img = new Image(); img.crossOrigin = "anonymous"; img.src = "http://example.com/image.png"; // or "myapp://image.png" img.onload = () => { ctx.drawImage(img, 0, 0); try { console.log(canvas.toDataURL()); // Expect base64 image data } catch (error) { console.error("Canvas is tainted:", error); } }; Notice that the image is blocked, and any attempt to access pixel data results in a CORS error. Expected Behavior: * The image should be displayed if it is accessible under normal CORS rules. * The API should allow access to the image data unless explicitly blocked by the server’s CORS policy. Actual Behavior: The image fails to load when crossorigin="anonymous" is applied. The API does not allow access to the image data, treating it as tainted. Removing crossorigin="anonymous" allows the image to display in some cases, but this is not a viable workaround when CORS enforcement is required. Regression: Works correctly on: iOS 17 and earlier Broken on: iOS 18 Environment: Device: iPhone/iPad iOS Version: 18.0+ Browser: Safari Suggested Fix: Apple should investigate this regression and allow custom schemes and HTTP images to be correctly handled under CORS policies when crossorigin="anonymous" is set. If the source allows cross-origin requests, Safari should not block the image or its use in .

After upgrading to Safari version 18, we encountered an issue with my extension’s background script not being able to access cookies. Previously, in Safari versions 17 and below, the extension worked as expected. Now, when the extension tries to retrieve cookies using browser.cookies.getAll(), it returns an empty list. However, if we open the extension’s developer tools, the cookies are visible and accessible. It seems that Safari only provides cookie data after the developer tools have been opened. However, after relaunching Safari and launching the extension without opening the developer tools, browser.cookies.getAll() still returns an empty list. Has anyone else experienced this? STEPS TO REPRODUCE Download this minimal app : https://www.icloud.com/iclouddrive/0bajlhnuQaG6T5NsFKXEB0U9Q#test%5Fcookies Compile test_mv2 extension (in test_cookies.getAll.zip). Launch test_mv2.app and activate extension. Click on the extension's button (browserAction). Open the developer tools. Observe an empty list of cookies. Click on the extension's button (browserAction). Cookies are retrieved as expected.

Is this code invalid on a phone running xcode16 iOS18? Class cls = NSClassFromString(@"WKBrowsingContextController"); SEL sel = NSSelectorFromString(@"registerSchemeForCustomProtocol:"); if ([(id)cls respondsToSelector:sel]) { [(id)cls performSelector:sel withObject:@"http"]; [(id)cls performSelector:sel withObject:@"https"]; } }

As with the adoption of MV3 standards among all major browser vendors that allow browser extensions at the client-side, I understand that this is the same with Safari as well, as mentioned here (https://www.wwdcnotes.com/notes/wwdc22/10099/). However, as with Firefox, browsers may choose to adopt them incompletely and with few changes. I had a few questions regarding how Safari views this transition and what would be the next steps from here. Thus, it would be really great if the browser team could provide your insights on any or all of the following points: Would Safari adopt the exact standards proposed by the Chromium ecosystem such as with functionalities like header-based modifications in the coming days.  What would be the general timeline be for this in general?  Does this also translate to the fact that existing standards with MV2 standards would not be allowed to operate any further, as with the timeline with Chromium? Regards

I am working in React Native and trying to use Deeplink. When app is installed code is working fine but when app is not installed not redirecting to App Store in Safari instead of that in Chrome that is working fine in safari when i click i got this error message "safari cannot open the page because the address is invalid" this is my apple-app-site-association file code { "applinks": { "apps": [], "details": [ { "appID": "CS666P223.com.seecard", "paths": [ "", "/recover/", "/settings/*" ] } ] } , "webcredentials": { "apps": [ "CS666P223.com.seecard" ] } } and this is my code in next "use client" export default function Home() { // Helper function for device detection // const isiOS = () => /iPhone|iPad|iPod/i.test(navigator.userAgent); const isAndroid = () => /Android/i.test(navigator.userAgent); const isiOS = () => { const userAgent = navigator.userAgent || navigator.vendor; return ( /iPhone|iPad|iPod/.test(userAgent) || (navigator.platform === "MacIntel" && navigator.maxTouchPoints > 1) ); }; const openAndSaveCard = () => { try { // let fallbackLink = ''; if (isiOS() || isAndroid()) { const card_id = "3434bee9675ee44b3dc65"; const card_owner_id = "34349675ee44b3dc43"; const card_for_saved = { "cardId": card_id, "ownerId": card_owner_id }; console.log("=-=-card_for_saved",card_for_saved) const encodedData = encodeURIComponent(JSON.stringify(card_for_saved)); window.location.href = `saveseecard://open?id=${encodedData}`; const androidAppStoreLink = 'https://play.google.com/store/apps/details?id=com.seecard'; const iosAppStoreLink = 'https://apps.apple.com/np/app/seecard/id6502513661'; fallbackLink = isAndroid() ? androidAppStoreLink : iosAppStoreLink; const timeout = setTimeout(function () { if (document.hasFocus()) { window.location.href = fallbackLink; } }, 2000); window.addEventListener('blur', () => { clearTimeout(timeout);; }); } else { alert("Your device doesn't support deep linking for this app."); } } catch (e) { console.log("Error:", e); } }; return ( <div className="cIcon ml-10 purpleBg" // onClick={() => { openAndSaveCard() }} onClick={openAndSaveCard} > <p className="container-text">Save Card</p> </div> </main> </div> ); }

Hello, I'm not able to get the webauthn attestation statement using the option (attestation.direct) on Safari. The answer I get is a fmt of none and a aaguid of zeros. The same code works on Chrome and I was able to get a none zero aaguid and a packed fmt attestation. Can you explain why this does not work on Safari ? Thank you.

Subject: Apple Pay JS - "Payment Was Cancelled by the User" Issue (Braintree + Server-Side Validation) Issue I am implementing Apple Pay using Braintree with server-side validation. However, when initiating the payment process, I receive the following error: [Log] Payment was cancelled by the user: (apple-pay-test-ucxp.onrender.com, line 286) Additionally, the console logs an ApplePayCancelEvent with: sessionError: {code: "unknown", info: {}} Despite successfully fetching merchant session validation data from the backend and completing merchant validation, the payment process does not proceed. Setup Details Payment Processor: Braintree (Apple Pay integration) Backend API: Fetching merchant session validation via createPaymentSessionGet Payment Processing: Using Braintree nonce tokenization Client-Side Code (Key Sections) session.onvalidatemerchant = async (event) => { try { const merchantSession = await fetch( "https://api.paybito.com:9443/ApplePay/api/apple-pay/createPaymentSessionGet", { method: "GET", headers: { "Content-Type": "application/json" }, } ).then((res) => res.json()); session.completeMerchantValidation(merchantSession); } catch (err) { console.error("Merchant validation failed:", err); session.abort(); } }; session.onpaymentauthorized = async (event) => { try { const payload = await applePayInstance.tokenize({ token: event.payment.token, }); const response = await fetch( "https://api.paybito.com:9443/ApplePay/api/braintree/process-payment", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ nonce: payload.nonce }), } ).then((res) => res.json()); if (response.success) { session.completePayment(ApplePaySession.STATUS_SUCCESS); } else { session.completePayment(ApplePaySession.STATUS_FAILURE); } } catch (err) { console.error("Payment authorization failed:", err); session.completePayment(ApplePaySession.STATUS_FAILURE); } }; Observations Merchant validation completes successfully. The error occurs before onpaymentauthorized executes. Session error code is unknown, making debugging difficult. Questions Has anyone encountered this issue before? Could this be related to how the validation session is fetched from the backend? Is there a way to obtain more meaningful debug information from Apple Pay? Any insights would be greatly appreciated!

I tried to create a content blocker for Safari and did it through Safari App Extension and Safari Web Extension. The XCode project for Safari Extension creates 2 applications: the “Main Application” (which is compiled into ".app") and the “Safari Extension” itself (which is compiled into ".appex"). If you want to create a content blocker, you must add “Content Blocker Extension” from the “File → New → Target” menu. This will be the third application in the group, which is also compiled into "*.appex". And now about differences... The first difference is that Web Extension does not have the right to work on any domains by default, unlike App Extension. For the App Extension, in the "info.plist" in the "SFSafariWebsiteAccess" section, we can remove "Allowed Domains" and in "Level" replace "Some" to "All". This is important because the content blocker should work on any domain, and not be turned on manually for each individual. This will not work in Web Extension and will have to be activated for each domain separately. The second significant difference between Web Extension and App Extension is that for security reasons it is more limited in page management. Web Extensions are supposedly focused on a common API for all browsers (Firefox, Chrome, Opera, Edge, Safari), but if I use Safari and want maximum integration with it, then I don't care about all those browsers. In this case, I don't need Web Extension. App Extension functions as a client-server even within the “Main Application”. This is quite expensive and can be fixed. You can remove the “webView” component from storyBoard and remove this files: “script.js”, “main.html”, “style.css”. After this you will get the pure storyBoard without any tinsel and communication between these layers. That’s will work perfectly because these are native Swift applications. p.s. To show the "Safari Extension" window after clicking on the icon on the toolbar, you need to change key from "Command" to "Popover" in the "info.plist" in the section "SFSafariToolbarItem" in the "Action". write your additions...

Hello All, On our iOS app, we plan to show tutorial (WKWebview) only in case user has safari extension disabled. How can iOS app know about status of Safari extension. Thanks, Anup

Even default Safari Web Extension project is not displayed on iOS 18.4 simulator ("No extensions installed"), so it's not possible to test extensions in simulator, only on real device.