Maven: not having to hunt dependencies in bookshelves, on file shares, on vendor web sites or sourceforge.
Actual extensions for Firefox (no, not the awful watered-down thing we have to live with today):
Back when Firefox created the extensions API they had two competitions with (I think) rather huge sum of cash as prizes for the three top spots.
The quality and ingenuity of those early extensions were nothing short of astounding IMO.
Later extensions were also brilliant.
(To fully understand just how powerful the early extension API was consider this: Firebug, for all practical concerns the precursor of todays developer consoles, was just another Firefox extension! Same with adblocking! Yes, ad blockers still exist, but only because of that legacy, no way someone would have proposed and gotten away with implementing that if the extension API had been invented today IMO.)
Actual extensions for Firefox (no, not the awful watered-down thing we have to live with today):
Back when Firefox created the extensions API they had two competitions with (I think) rather huge sum of cash as prizes for the three top spots.
The quality and ingenuity of those early extensions were nothing short of astounding IMO.
Later extensions were also brilliant.
(To fully understand just how powerful the early extension API was consider this: Firebug, for all practical concerns the precursor of todays developer consoles, was just another Firefox extension! Same with adblocking! Yes, ad blockers still exist, but only because of that legacy, no way someone would have proposed and gotten away with implementing that if the extension API had been invented today IMO.)