When I try to download a file (image for example) I right click, select save image as and when I navigate to what folder I want to save image to, the page freezes. I can move the pointer and drag the download windo but cannot cancel or save. I have to do a force quit. This is with firefox. With safari, the images sometime never download completely. This never occurred when I used High Sierra. It started when I installed Mojave. Very frustrating. Does anyone have any possibles solutions to this? Thank you!