Cant ever remember putting anything burning at the end of the ramps we built as kids, but can sure remember putting my little brother there
Oh, we certainly did fire jumps.
The trick was to get the timing right for throwing a big dry leafy branch on just as the rider set off down the hill, so it would be at full flame height as he arrived at the jump. There were definitely some jumps through head-height flames.
We were very careful to make sure we had our eyes closed when jumping through fire, because somebody's brother said that if a flame touches your eye you'll be blind for ever. Safety first!
Of course, this was all done in a big block of suburban bushland, butted up against houses, at a time of year when dry leafy branches were in plentiful supply. Surprisingly, we didn't start any bushfires that we couldn't put out ourselves. I do remember running away when the fire engines arrived after a nearby resident saw the smoke of our fires  and got a bit trigger happy with the phone
 maybe a fire-jumping fire, maybe another kind. We had several games that involved setting fire to stuff in the bush. And lots more that involved throwing rocks at each other. One personal favourite involved one team trying to free-climb the (~30 foot) cliffs while the other team tried to stop them by chucking whatever they could find down at them. I really don't know how I survived my childhood