[Webkit-unassigned] [Bug 226440] New: Blob url downloads fail when triggered from webextension

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=226440

            Bug ID: 226440
           Summary: Blob url downloads fail when triggered from
                    webextension
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Apple Silicon)
                OS: macOS 11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: victorhlin at gmail.com

Blob url downloads fail when triggered from a webextension tab. The tab is created with `chrome.tabs.create({ url: /wordlist.html })`. wordlist.html embeds a script with the following code to trigger downloads when clicking on a button:


```
        let saveBlob = new Blob(['content'], { "type": "text/plain" });
        let a = document.getElementById('savelink'); // tab html contains "<a id="savelink" download="download.txt"></a>"
        const blobLink = URL.createObjectURL(saveBlob);
        a.href = blobLink;
        a.click();
```


This opens in the existing tab (replacing its content) and fails with the following safari error:

```
Safari can’t open the page “blob:safari-web-extension://20101d16-cc55-4a3f-a307-a03b6e2df273/07f5a98e-8fbd-409e-9113-58afe3c748c8”.

The error is: “The operation couldn’t be completed. (WebKitBlobResource error 1.)” (WebKitBlobResource:1)
```

I found some related bugs on non-extension pages, e.g https://bugs.webkit.org/show_bug.cgi?id=190351 (usage of target="_blank"), https://bugs.webkit.org/show_bug.cgi?id=211234 (bugs with immediately revoked object urls) ,  The presence of the `target` attribute doesn't seem to matter, and it seems like whatever was fixed in the latter bug doesn't apply to this extension tab case.

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