open the headlight and look at the connector the connectors are known to melt and sometimes when people install the lights it pushes the pin out and it dangles around sometimes shorting.
unplug the bulb on the headlight replace the fuse and try the headlight again and see if it blows if it does then there is a wiring issue somewhere a bad ground doesnt always cause the fuse to blow
as for both front and rear going thats actually a rare event as those circuits are separate but use totally different grounds
is the headlights/tails factory original or aftermarket and was any mods done to the car??
What I drive
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(2002 Wagon - is For Sale)
2006 Focus ZX4 SAP - Daily Driver (Psychotic Black)
2007 Focus ZTW Wagon - Project (Dark Shadow Grey)
2003 Jaguar X-Type - Project (Money Pit)
2002 SVT Focus - Project (#2760 of 4788)