Closed Bug 1312013 Opened 4 years ago Closed 4 years ago

Download Panel glitches when a download is paused and resumed


(Firefox :: Downloads Panel, defect)

Not set



Tracking Status
firefox49 --- affected
firefox50 --- affected
firefox51 --- affected
firefox52 --- affected


(Reporter: ccomorasu, Unassigned)


[Affected platforms]:

 Windows 10 x64
 Windows 8.1 x64
 Ubuntu 14.04 LTS
 Mac OS X 10.10.5

[Steps to reproduce]:

 1. Launch Firefox.
 2. Go to " ".
 3. Download one large file.
 4. Open the Download Panel.
 5. Pause the download.
 6. Resume the download.
 7. Cancel the download.
 8. Retry the download.

[Expected result]:

 The downloads are performed without any issues.

[Actual result]:

 The download panel glitches after step 6 and 8. The glitch consists on the progress bar being complete for a second.

[Additional notes]:

 a. Gif showing the issue: .
 b. The issue is not reproducible on  Windows XP x32 and Windows 10 x32.
 c. Ubuntu 14.04 the progress bar does not appear complete for that one second.
 d. Sometimes the "Pause" button is inactive after the first pause and resume. (as it is visible in the Gif).
I was able to reproduce this on old builds as well, going back to 30.0 RC so I think it's safe to say this is NOT a recent regression.
The most likely cause of this issue is that, when we fail to resume the download from where it stopped, we display an "undetermined" progress bar for a brief time while the server sends us the size of the new file, that can be different from the size we had before. This is the expected behavior.

The appearance of the progress bar is now different between platforms, so you may not notice it on some platforms. We're unifying the appearance of the progress bar in bug 1301384.
Closed: 4 years ago
Resolution: --- → WONTFIX
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