[Webkit-unassigned] [Bug 45225] New: Conflicts with Highslide JS image viewer and JSBlacklist extension

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45225

           Summary: Conflicts with Highslide JS image viewer and
                    JSBlacklist extension
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
               URL: http://erikhinterbichler.com/software/herald/
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ehinter at gmail.com


I'm using the JSBlacklist extension in Safari:
http://homepage.mac.com/drewthaler/jsblacklist/

I'm also using Highslide JS on my site:
http://highslide.com/

When I enable JSBlacklist, it seems to break Highslide. You can try on my site with the screenshots at the bottom:
http://erikhinterbichler.com/software/herald/

I reported this to the JSBlacklist developer, and he believes it's a bug in Webkit. I'll reproduce the email he sent me below:

----

Thanks for the report! From a quick test, it looks like the same problem appears with other Safari content-blockers too (like Facebook Cleaner and Safari AdBlock). So it seems like a WebKit bug rather than a JSBlacklist bug.

In fact, it sounds like a bug I filed recently: WebKit bug #44529. There's something in the way that Safari handles content-blocking (via the beforeload: listener) which affects page rendering in a subtle way. The problem occurs even if you create a do-nothing extension which does nothing but install a completely empty beforeLoad listener.

Anyway, to prove this I created an empty BeforeLoad.safariextz, which I attached to that bug. It breaks cgbg.com, where I got the original report, and it appears to break your page too.

-- 
Configure bugmail: https://bugs.webkit.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.