Navigation-related listeners are not called after opening an embedded Web page

I made a Safari Web extension that's supposed to work like this:

  • WHEN: Safari is opening http://example.com/
  • THEN: The extension opens a page embedded in the extension instead.

This is the implementation of background.js:

browser.tabs.onUpdated.addListener(async function (tabId) {
    const tab = await browser.tabs.get(tabId);
    if (tab.url == "http://example.com/") {
        const destination = browser.runtime.getURL("embedded-page.html");
        browser.tabs.update(tabId, { url: destination });
    }
}, null);

This is the source project: https://www.icloud.com/iclouddrive/042qIjivEoJ0V3qIcLGcytAPA

When opening http://www.example.com/ for the first time, it successfully navigates to the embedded page. However, once that navigation is done, the extension no longer works that way unless I re-enable the extension. It's like the listeners are removed by that navigation.

This is the video of this issue: https://www.icloud.com/iclouddrive/0f9Yl1jC9eQ8OmgH8vAtEA6Pw

Can you replicate this on your Mac? And do you know what's the cause?


This happens for a listener of browser.webNavigation.onBeforeNavigate too. Maybe more.

On the other hand, when I set a normal page such as https://www.apple.com/ to destination, It always works fine for me. So I'm wondering if this issue is related to the embedded page.

FYI, I already reported this issue as FB9967637 on 27th March but no reply from Apple as of now.

My environment

  • macOS Monterey 12.3.1 (21E258)
  • Safari 15.4
Answered by Engineer in 718992022

This should also be fixed on the latest version of Safari Technology Preview - please let us know if that's not the case!

I've just chatted with an Apple developer (Timothy Hatcher) in the WWDC's lab. According to him, this has already been fixed internally and will be deployed soon.

So this issue will be solved once your users update the Safari version to (hopefully) 15.6 or later, since the current version is 15.5.

Thanks, Timothy. 🙂

Accepted Answer

This should also be fixed on the latest version of Safari Technology Preview - please let us know if that's not the case!

Navigation-related listeners are not called after opening an embedded Web page
 
 
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