Starting with Firefox Quantum 57 when I drag and drop an image the icon will show my preferred application but the "get info" shows the "open with" application to be adobe photoshop. I initially tried the typical Mac solution to change the "open with" app and then select "change all". This does not fix the problem. If I do a "save image as" then the image will open with my preferred app. I have tried to reset FF. I deleted FF and the profile folder and started fresh but the problem remains. I then tried the Developer edition and it had the problem. Then I tried Nightly and it worked as it should. Today I updated all three, Nightly, Developer and FF. Now, using the same profile, Nightly and Developer work as they should. FF still has the issue. FYI, OXS 10.11.6 (15G19009) Firefox 58.0 (64-bit) Developer 59.0b4 (64-bit) Nightly 60.0a1 (2018-01-26) (64-bit)