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Every earplug sold in the U.S. is required by law to have a Noise Reduction Rating (NRR) published for it and also the data used for calculating the NRR - the mean Real-Ear Attenuation at Threshold values and the standard deviations of the attenuation values for the one-third octave bands of noise centered at 125, 250 500, 1000, 2000, 3000, 4000, 6000, an 8000 Hz for a group of ten listeners as measured in accordance with ANSI S3.19 Experimenter Fit Procedure. That applies regardless of whether the earplug is intended for the occupational, recreational, or home environment. There is no legal way to have an earplug designed to reduce noise for any application that is free from this requirement. So, where are the data for this earplug?
Unsurprisingly, you can't find a website for EarFirst. I did find a list of the attenuation ranges on the Amazon listing for it.