ive had this come and go as well , yes i use firefox too
its only happened with poster TrVrPhiLpsiNdstrys and as i recall mainly in the Random pics, next thread
ive mentioned it in there too once or twice
it just comes up as a blank post to me
tho the work around i found was to quote the post (from memory with out posting quoted post) and the link to the pic comes up so i can then open link in another tab