Question: File extensions missing when downloading from Firefox
After upgrading to Sierra, I have a weird issue where the file extension .jpg is missing from any file I download from the stock site Thinkstock.
It only happens with Firefox, and only with that one site.
And yes, I have "show file extensions" selected in the finder.
iMac (27-inch, Late 2013), OS X Yosemite (10.10.3)