That's what I wanted to know. Trying to decide on a laptop for Mom, between an Intel Celeron 4205U (2C/2T, 1.80Ghz, $209), a Pentium Gold 5405U (2C/4T, 2.30Ghz, $269), or an i3-8145U (2C/4T, 2.10Ghz, Turbo to 3.90Ghz, $289).
The i3 has AVX/AVX2 support, and seems much faster in Passmark, especially the ST bench, mostly because of the beastly turbo clock (for mobile, at least).
If Firefox can utilize the AVX/AVX2, for VP9 decoding especially, since that's kind of CPU-heavy, that would be a big improvement in watching web videos. Then again, the laptop(s) in question are all 768P, which isn't all that heavy to decode, I suspect.