My Imac running Mavericks has been functioning perfectly and I have never had a problem uploading files to sites or applications online until two days ago when suddenly I cannot upload anything to any place within FIREFOX. I have found a few places where I can drag and drop a file to upload it but not many (including here - tried to drag an image to upload for you and it froze the page, reloaded it and now I am typing this whole mess over again!) I am a graphic designer and send files through email, and I also build and update websites for several clients, so this is a HUGE problem. I have NO trouble uploading or finding files within applications or programs on my computer itself even now, but the minute I try to open the finder to select and upload a file into FIREFOX I get a blank finder window with just the spinning "loading" symbol and it NEVER finishes and load the window. This is unacceptable. ---- By the way, I also have a Toshiba laptop and it has NO problems uploading files into Firefox. Does anyone know if there is a Firefox patch or something for Mac computers that can help?