I left my room for ~15 minutes, and when I came back, the desktop window's size collapsed to fill only a small window on the screen, leaving a large black area around the desktop, and a message was displayed saying that because my computer's memory was low it wanted me to close firefox.
I understand my system's memory might be low, but how do I revert the size of my desktop back to normal? Changing the resolution does not solve this issue.
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