When I close Firefox and later reopen it, I get a box saying it is open and I must close it.
When I try to open Firefox, I get a box saying it is open, and I must close it. I do so, and a new Firefox pops up. However when I try to close that, it won't do so.
When I try to open Firefox, I get a box saying it is open, and I must close it. I do so, and a new Firefox pops up. However when I try to close that, it won't do so.