Oh yeah, I used to have an addon that would pop up a full size image file if you hovered over a link to it (e.g., if you hovered over a thumbnail on a google image result page it would pop up the full size image). It also would automatically parse youtube links and turn them into inline video. It stopped working several versions of Firefox back and I never bothred to find it again.
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'He who receives an idea from me, receives instruction himself without lessening mine; as he who lights his taper at mine, receives light without darkening me.'
-TJ
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