If the scanwhendone feature is turned on for downloads, then the detected antivirus program will be used to scan the file. It could also be possible if it is happening on the same network that the proxy is making a change in the file.

Please try these troubleshooting steps:What to do if you can't download or save files

And report back what were the results! Thank you.

Thanks for the reply. I do not have antivirus on the computers having the problem, and I did not see a scanwhendone feature.

The problem seems to be with Parental Controls. All of the affected users have OSX Parental Controls turned on. We started doing this years ago so that Standard Users could manage their own printers, and it has worked very well until now.

I turned off Parental Controls on my sample account on the affected computer, and was able to download without failing. I was also able to continue to manage printers as the standard user, so I am hoping that printer management no longer has to be allowed via parental controls. I will do further testing on our other affected computers.

I hope this helps someone else!

This is directly connect to Parental Controls. In the firefox developer console i found the following error message:

Full Message: Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIParentalControlsService.blockFileDownloadsEnabled]

However, in OSX there is no specific parental control for allowing the download of files!! it seems to prevent the download of files simply because you are using a parental control enabled user account.

Safari works fine in the same account.

An interesting thing is that firefox still actually downloads the file, but it has random character names and has a .part extension. see dir listing below. i can still rename the file to .dmg and it works fine.

user-mbp:Downloads user$ ls -al total 82544 drwx------+ 10 user staff 340 Sep 22 08:28 . drwxr-xr-x+ 20 user staff 680 Aug 25 16:43 .. -rw-r--r--@ 1 user staff 6148 Sep 22 08:01 .DS_Store -rw------- 1 user staff 0 Feb 5 2013 .localized drwx------ 3 user staff 102 Feb 5 2013 About Downloads.lpdf -rw-r--r--@ 1 user staff 0 Sep 22 08:28 Shockwave_Installer_Full_64bit.dmg -rw-r--r--@ 1 user staff 13695887 Sep 22 08:28 Shockwave_Installer_Full_64bit.dmg.part -rw-r--r--@ 1 user staff 13695887 Sep 22 08:26 lNNwqm8c.dmg.part user-mbp:Downloads user$

I filed https://bugzil.la/1078283 for this.

Looks like this will be fixed in version 33 when it comes out tomorrow :-) See https://bugzilla.mozilla.org/show_bug.cgi?id=1073134

It works! Thank you!!!

I have version 33.0.1 and i still have this problem, any other help ? Thanks!

HI Punk-Mask, Please start a new thread with your troubleshooting information to allow further investigation.

If the above information does not resolve your issue, please consider creating a new thread containing the specific details of your issue.

Doing so will allow the Mozilla volunteers to give you solutions that are more helpful to you. This may help them to solve your problem faster and more efficiently.

Please, feel free to post the link to your thread on this thread for volunteers interested in assisting you.

Thank you.