Downloads do not complete
When downloading files using the downloads window, quite often downloads seem to stall when they are very nearly complete. This happens in both version 6.0 and version 5.0. I have left the window sitting in this state for up to 20 minutes with no change.
Clicking on the pause button, waiting a few seconds, and then clicking the resume button causes the download to complete almost immediately.
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Troubleshooting extensions and themes
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Troubleshooting plugins
Check and tell if its working.
It is possible that your anti-virus software is corrupting the downloaded files or otherwise interfering with downloading files by Firefox.
Try to disable the real-time (live) scanning of files in your anti-virus software temporarily to see if that makes downloading work.
See "Disable virus scanning in Firefox preferences - Windows"