About a week ago, I noticed that a download from Firefox didn't complete. I looked at the download dialog and the download had been cancelled. I clicked the download and restarted it; it seemed to start but then I couldn't open the file.
I then copied the download link into Chrome and it worked as normal. I went to the file and double clicked it but my system told me I didn't have permissions to open the file. I right clicked and went to Properties and there was a button at the bottom called "Unblock" - I unblocked the file and it then worked as normal.
For the last week or so, I have been downloading files with this technique but it's a pain. What is going on here? I clicked around in Firefox options and found no sign of a setting that needs my attention. Has anyone else seen this?