Those tabs telling you to restart are because the OS upgraded Firefox in the background and Firefox detected that its files changed under it. It tells you to re

Those tabs telling you to restart are because the OS upgraded Firefox in the background and Firefox detected that its files changed under it. It tells you to restart so you don't get buggy broken behavior if anything was incompatible between the two versions. Firefox's built-in update system waits for a natural browser restart so it doesn't do that.