580199 - >20 active downloads causes Firefox to freeze

Status: RESOLVED INCOMPLETE

(Firefox :: General, defect)

Description

[ryan]

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; .NET4.0C)
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; .NET4.0C)

I can consistently cause Firefox to crash with 21-22 active downloads. I have not been able to get beyond 22. I have tried this with downloads from the same host or multiple hosts with the same result. The main window and the download window both freeze. I can monitor network traffic and see that the transfers stop at the same time. If I terminate the process and reopen Firefox, I can resume the downloads. I have tried waiting up 1 hour to see if Firefox will unfreeze with no success. After long waits, I cannot resume the downloads. I have not determined what that threshold is though.

Reproducible: Always

Steps to Reproduce:
1. Initiate multiple downloads large enough to accumulate more than 20 active ones.
Actual Results:  
Firefox freezes

Expected Results:  
The downloads should eventually complete utilizing the available bandwidth.

I don't use any add-ons that affect the download functionality. I use the built-in download manager. The computer I have done this testing with should be more than capable of handling this task. It is a Core i7 machine with 8GiB RAM. My internet connection is Comcast's Speedtier Extreme which typically benchmarks at 25Mbps down/5Mbps up for me.

Comment 1

[Tyler Downer [He/Him]]

Reporter, Firefox 4.0.1 has been released, and it features significant improvements over previous releases. Can you please update to Firefox 4.0.1 or later, and retest your bug? Please also create a fresh profile (
http://support.mozilla.com/kb/Managing+profiles), update your plugins (Flash, Java, Quicktime, Reader, etc) and update your graphics driver and Operating system to the latest versions available. 

If you still continue to see this issue, please comment. If you do not, please close this bug as RESOLVED > WORKSFORME

filter: prefirefox4uncobugs

Comment 2

[Wayne Mery (:wsmwk)]

Do you still see this problem when using a current version started in safe mode?
https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode?redirectlocale=en-US&redirectslug=Safe+Mode

If you still continue to see this issue, please comment. If you do not, please close this bug as RESOLVED > WORKSFORME

Comment 3

[Phoenix]

Resolved per whiteboard