When is expected release date for SpiderMonkey version 52?

According to the SpiderMonkey releases page (https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Releases), there are no current releases available and version 52 is the next future release. Is there an estimated timeframe for when version 52 will be released?

Looking in https://ftp.mozilla.org/pub/spidermonkey/prereleases/59/, there are two preview builds of SpiderMonkey 59, the most recent posted on March 5 of this year. And you can go to the try server and download the most recent package, but of course those aren’t release builds. I don’t know more than that, I’m afraid…

Sheppy

Thanks for that info. Do you happen to know if mozjs-59.0.0pre1 or pre2 are being used by Firefox version 59.0.X?