Do you note any errors in Firefox's Error Console (Ctrl+Shift+j) or Web Console (Ctrl+k)?

When you have a problem with one particular site, a good "first thing to try" is clearing your Firefox cache and deleting your saved cookies for the site.

(1) Bypass Firefox's Cache

Use Ctrl+Shift+r to reload the page fresh from the server.

Alternately, you also can clear Firefox's cache completely using:

orange Firefox button (or Tools menu) > Options > Advanced

On the Network mini-tab > Cached Web Content : "Clear Now"

If you have a large hard drive, this might take a few minutes.

(2) Remove the site's cookies (save any pending work first). While viewing a page on the site:

• right-click and choose View Page Info > Security > "View Cookies"
• Alt+t (open the classic Tools menu) > Page Info > Security > "View Cookies"

In the dialog that opens you can remove the site's cookies individually.

Then try reloading the page. Does that help?

Could you also try Firefox's Safe Mode? That's a standard diagnostic tool to bypass interference by extensions (and some custom settings). More info: Diagnose Firefox issues using Troubleshoot Mode.

You can restart Firefox in Safe Mode using

Help > Restart with Add-ons Disabled

In the dialog, click "Start in Safe Mode" (not Reset)

Any difference?

Thanks very much for the reply.

Actually, if you want to see it first hand in all it's glory:

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/AsyncFileUpload/AsyncFileUpload.aspx

It's not just our site. Any site running this element (for example, probably other AJAXControlToolkit elements as well), are pulling this error.

Thank you for the link, I do get the same problem.

This issue was reported on the relevant site but I don't see any official response: AJAX Control Toolkit - View Issue #27429: AsyncFileUpload with Firefox 22.0b1 script busy.

Since no script errors appear in the console, I think someone with better debugging skills than I will need to take a look at it and see where it's hanging up or perhaps looping unexpectedly.

Well, thanks for trying. I saw that as well it's too bad nothing has come from it. I've posted something about it on the FF bugzilla. Hopefully something will come from it.

if that's of any help, I can confirm that FX 21 did not have this problem, and that FX 22 has it as reported.

I have the same problem AsynFileUpload of ControlToolkit (framework 3.5) Firefox 22.0

Quote: I've posted something about it on the FF bugzilla.

For reference:

• Bug 887857 - FF22 & AJAX Toolkit

I have the same problem.

http://forums.asp.net/t/1955837.aspx?AsyncFileUpload+crash+FF22+and+over

Hi deliciushot, from what I can see, the library has not been updated to account for the change in Firefox 22.

If this affects your own website, please see the CSS workaround described in this thread: AJAX Control Toolkit - View Issue #27429: AsyncFileUpload with Firefox 22.0b1 script busy.

If this affects a website you use often, please point them toward that workaround.