Windows Plugin Hang UI

Summary

• An UI presenting which plugin is unresponsive and allowing to kill it will be shown after each crash.
• Afterwards, plugins will be killed automatically after a longer timeout, between 45 and 60 seconds.
• This feature is available starting Firefox 19 Beta
• Currently, this feature is available only on Windows OSs and regards only Flash hangs
• By default, Windows Plugin Hang UI is enabled
• For disabling the Windows Plugin Hang UI, you need to go to about:config, and set the value of dom.ipc.plugins.timeoutSecs such that it is smaller than the value of dom.ipc.plugins.hangUIMinDisplaySecs

• Screenshot of Plugin Hang UI

Reference

• Wiki page
• Aaron's blog post

Use Cases to Test

Test that the Plugin Hang UI dialog is displayed with:

• Flash plugin installed and used in several tabs/windows

Test Cases

• Test cases and test results can be seen in the Google Spreadsheet
• They are also present in MozTrap, in the Windows Plugin Hang UI test suite.

Bugs

• bug 801806 - SecReview: Windows Plugin Hang UI - NEW
• bug 805591 - Add UI to be shown when plugin is unresponsive - RESOLVED FIXED
• bug 794690 - Add telemetry for plugin hang recovery - RESOLVED DUPLICATE
• bug 827330 - Windows build error in PluginHangUIParent.cpp - RESOLVED FIXED
• bug 818307 - Add flag to chromehang when user selects "Continue" in Plugin Hang UI - NEW
• bug 822051 - kill flash hangs on unsuspend - NEW
• bug 828034 - crash in mozilla::ipc::RPCChannel::EnteredCxxStack - VERIFIED FIXED
• bug 829909 - crash in nsWindow::Enable @ UserCallWinProcCheckWow - RESOLVED FIXED
• bug 830910 - slow script warning does not account for plugin hangs - NEW
• bug 833560 - Increase Plugin Hang UI threshold - VERIFIED FIXED
• bug 834127 - Windows is intermittently not setting WS_VISIBLE on the Plugin Hang UI dialog - VERIFIED FIXED
• bug 845491 - Unresponsive plugin/plug-in (hang dialog): Button width doesn't fit text size - VERIFIED FIXED

Sign off

Criteria

• All the test cases were executed.
• All the blocker, critical, major bugs have been fixed.

Sign offs

• Firefox 20 Aurora (pre-beta sign off) - 02/15/2013
  • Ran the test cases on Windows 7 64bit, Windows 7 32bit, Windows 8 32bit, Windows 8 64bit, Windows XP 32bit, Windows Vista 32bit