A flame mitigation device configured to be located proximate a main container opening of a fuel container having a fuel-receiving chamber, with the main container opening permitting liquid fuel to flow into and out of the fuel-receiving chamber. The flame mitigation device comprises a sidewall defining a plurality of perforations through which the liquid fuel can flow to dispense such liquid fuel from the fuel-receiving chamber when the flame mitigation device is installed within the fuel container. At least a portion of the perforations defined in the sidewall are downwardly sloping perforations, with the downward angle of the downwardly sloping perforations being at least 1 degree below horizontal. And at least 20 percent of the total open area defined by all of said perforations is attributable to downwardly sloping perforations.