I presume the current browser mining is not actually Bitcoin mining, but some Alt coin or Cloud mining that are done, with a Bitcoin reward?
We have some interesting times ahead of us with all of these forks and new technologies. Crypto currencies is the place to be!
You are wrong, Bitcoin Gold is ASIC resistant, so it will be mined with CPU/GPU's and this will be better for "Browser mining" type operations. Yes, I know it has not forked yet, but there is no harm in asking, if Freebitco.in is considering it as a possible alternative to be mined. Ethereum and ZCash use the same algorithm as Bitcoin Gold, so it might be profitable now to mine that with a browser, instead of Bitcoin mining.
If you want people to mine something, why not chose something that might be more profitable for them?