I opened Firefox this morning and found about 20 extra tabs added to my normal tabs, and each tab was either a desktop file opened or a file explorer folder tree (not sure if that's what it's called, but a list of folders were shown). Here is an example of one of the addresses in the address bar: file:///C:/Users/Name1%20Name2/Desktop/IMG_0098.jpg. Why is this happening and what should I do about it?