516910 - Downloads silently fail if default download location does not have write permissions for the user

Status: VERIFIED DUPLICATE of bug 429827

(Firefox :: General, defect)

Description

[Michael]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.3) Gecko/20090824 Firefox/3.5.3 (.NET CLR 3.5.30729)

When prompted to download a file and save it to disk, the download silently fails if your default download location does not have write permissions for the user, if Firefox has been set to always download files to a particular folder without prompting for a location.

Reproducible: Always

Steps to Reproduce:
1. Set your download folder to a location where you do not have write permission, or set your download folder to not have write permissions for your user.
2. Goto any website where you will be prompted to download a file.
3. The save dialogue appears, asking if you want to save the file, open it, or cancel.  Select save.

Actual Results:  
The download silently fails without explanation, and the download manager window does not appear.  The download doesn't appear in the download manager at all.

Expected Results:  
Firefox should warn me that I do not have write permissions to save files in that folder, like it does when you save a file by right-clicking a link and selecting "save target as...", and manually selecting a location.

It could prompt me to save the file to another location that I do have write permissions, optionally allowing me to set the new location as the default download folder instead.

Or it could use a User Account Control elevation prompt (if the user is an administrator and running Windows Vista or later), allowing me to modify the permissions of my download folder in Windows Explorer.

I'm using the default theme, no special configuration.