578882 - Flash dialogs trigger plugin crash detection, hang Firefox

Status: VERIFIED DUPLICATE of bug 570249

(Firefox :: General, defect)

Description

[Jay Paroline]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 (.NET CLR 3.5.30729)

Since plugin crash detection was added to Firefox I have been experiencing the following issue when using the debug version of Flash (required for my job):

If Flash pops up a dialog (i.e. a warning or a notice about a crash) and I take too long to dismiss it (say because I am reading the notice), this makes Firefox think that the plugin has crashed. At that point the page switches to a sad face LEGO piece, but the browser itself becomes completely unresponsive to clicks or keyboard events. It seems to think there is still a modal dialog box in front of it, but it is in the foreground. At that point the only recourse is to kill Firefox and start it again.

I don't mind so much that the crash detection is misfiring, but I would really like if it didn't take the whole browser down with it.

Reproducible: Always

Steps to Reproduce:
1. Install debug version of Flash player plugin
2. Visit a website that triggers an alert dialog from Flash
3. Wait until Firefox decides that the plugin has crashed
Actual Results:  
Firefox hangs and will not respond to clicks or keyboard activity.

Expected Results:  
Firefox works as expected and it's possible to close or reload the "crashed" tab.

Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.6) Gecko/20100625 Firefox/3.6.6 (.NET CLR 3.5.30729)