585822 - Session Restore does not resume download

Status: NEW

(Firefox :: Session Restore, defect)

Description

[u279076]

Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b4pre) Gecko/20100809 Minefield/4.0b4pre

When resuming a session for a force-quit, downloads start again instead of resuming.  zpao indicated on IRC that he thought Session Restore should just start a new download and not do anything with the old download.  My understanding was that this would leave a FAILED download and a CURRENT download of the same file in Download Manager.

Zpao also indicated that he didn't think downloads should resume unless the server supports the auto-resume byte offset header.

What I am seeing currently is that the same download restarts from the beginning.  I'll attach screenshots to illustrate.

Steps to Reproduce:
1. Navigate to the Ubuntu download (see URL)
2. Click the big red download button on the page
3. Click Save File
4. Wait a minute to download some of the file
5. Kill the Firefox process
6. Start Firefox
7. Tools > Downloads

Result:
Download appears to have restarted from the beginning

Expected:
Download resumes from where it left off (or should it?)

Comment 1

[u279076]

Attachment: Screenshot: Before crash

Comment 2

[u279076]

Attachment: Screenshot: After restore

Comment 3

[Paul Silaghi, QA [:pauly]]

Still an issue on Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0) Gecko/20100101 Firefox/10.0. 
The download starts from the beginning after restore.