Got android version firefox, but I haven't hear Internet explorer and chrome for android before 

If you use LG P500, it cant install firefox....

Do you try opera before?

maybe this may help... after u try its easy peepsy!
link

is it u turn off following things :
by going menu > setting > location and security
and untick top 2 things ???

just b patient to wait it around 1minute
if problem still exist,try restart ur phone
and no illegal software discussion at LYN ~

setcpu is a application which allow u to overclock ur phone processor
is it u using stock rom ??

stock rom means u using phone original OS which make by LG
u can check it on using menu > setting > about phone and c the kernel n software version is got something lg electronic and v10c/d/e/f ?
if yes then means u using stock rom
same here,haven't overclock
i know the way,but keep stuck on LG Logo when reboot phone or turn phone normally more than 10minute
so i giv up and go emergency mode n use kdz updater flash back original firmware