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Hovering either of the two boxes below, you'll notice that they change shape and stretch out even though the ::after that's set to appear explicitly has position:absolute. From what I can tell, it's rendering instead as if position:relative were specified. This doesn't occur in other browsers, but tested wrong in numerous version of Firefox up through versions 33.1.
What gives, Gecko?

• C:\...\absolute\favorite\error
• __pycache__
• __init__.py
• scatterbraining.py
• littlefrustrations.py def pleez_work():      geckoRenderer = my_fave_renderer()      return bugZilla.submitAEReport(new_report())      # ut labore et dolore magna aliqua. Ut enim ad minim veniam,      # quis nostrud exercitation ullamco
• causingbigsadness.py
• notneverending.py
• 255glitches.py
• thesourceofdownfall.py

• C:\...\couldn't\be\biased
• __pycache__
• __init.py__
• scatterbraining.py
• littlefrustrations.py def fancy_math(argument):      x = argument;      return 2 + 2*arctan(-x + 500)/pi      # the above return value is vital      #.. so you shouldn't change it, alright?
• causingbigsadness.py
• notneverending.py
• 253glitches.py
• thesourceofdownfall.py