Closed (moved)
Prevent add-ons updates from being written to the OS temporary directory
Example:
1475974982800 addons.xpi DEBUG Download started for https://www.eff.org/files/https-everywhere-5.2.5-eff.xpi to file C:\Users\%USERNAME%\AppData\Local\Temp\tmp-v8h.xpi
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information