1046426 - [e10s] Crash when using "ScrapBook" add-on's DOM Eraser: Assertion (!DispatchingUrgentMessage()) failed. sync messages forbidden while handling urgent message

Status: RESOLVED DUPLICATE of bug 1010737

(Firefox :: Extension Compatibility, defect)

Description

[Alice0775 White]

Tab crashed when click a page using 
bp-f54a9d53-0ad2-4540-b554-d43ec2140730

Steps To Reproduce:
1. Enabled e10s autostart
2. Install ScrapBook 1.5.9 https://addons.mozilla.org/en-US/firefox/addon/scrapbook/
   And restart
3. Open https://www.mozilla.org/en-US/firefox/help/
4. Alt, select ScrapBook > Save Page As...
5. Save
6. Alt, select ScrapBook > Firefox Help (which is saved at step 5) 
7. Click "DOM Eraser" icon at the bottom toolbar
8. Click one of a topic conainer to remove
9. Repeat step 8 if necessary

Actual Results:
Tab crashed

Expected Results:
No crash:

Comment 1

[Chris Peterson [:cpeterson]]

###!!! [MessageChannel][Child][/builds/slave/m-cen-osx64-ntly-0000000000000/build/ipc/glue/MessageChannel.cpp:585] Assertion (!DispatchingUrgentMessage()) failed.  sync messages forbidden while handling urgent message 
  MessageChannel 'backtrace':
  [(0) in async ???(actor=2) ]
  [(1) out async PJavaScript::Msg_CallOrConstruct(actor=-4) ]
  [(2) out sync PBrowser::Msg_GetInputContext(actor=2) ]
  remote Interrupt stack guess: 0
  deferred stack size: 0
  out-of-turn Interrupt replies stack size: 0
  Pending queue size: 0, front to back:
[Child 32884] ###!!! ABORT: sync messages forbidden while handling urgent message: file /builds/slave/m-cen-osx64-ntly-0000000000000/build/ipc/glue/MessageChannel.cpp, line 1739