I'm not quite sure what happened, but when I switched back to my cookie clicker tab I was suddenly bombarded by dozens of golden cookie notifications of various types, including nearly every kind of production multiplier. The cumulative effects took me from level 1 prestige to level 456 prestige in about a minute (with no prior ascensions, I recently started a completely new save). I use chrome with the uncanny cookie clicker extension, but no other add-ons.
Has anyone ever heard of this happening? Is it a rare but normal occurrence? I feel I should also mention that the incident did NOT result in the four-leaf cookie shadow achievement. If need be, I exported my save from just after the incident in case looking at it would give any useful information.