Some of the more dangerous power strips contain protector parts. These are typically near zero (hundreds of) joules. So undersized that its MOVs must disconnect as fast as possible during a potentially destructive transient. Sometimes those MOVs do not disconnect fast enough resulting in a power strip or house fire. A power strip must always have a 15 amp circuit breaker so that it will protect from fire when a resident makes a serious mistake (ie daisy chain them, connect to an air conditioner, connect a heater). A user is expected to sum amperage from each device using numbers already on each appliance label. Then a strip is not overloaded. And further protected by the emergency backup protection - the circuit breaker. But the other reason for fire (protector parts not disconnecting fast enough) is a fire threat that no one can protect from. If using a real Christmas tree, then better is to use a (or replace the existing) circuit breaker with an arc fault type. Not GFCI; are fault. Because a Christmas tree fire can take out an entire house in only five minutes.
