Although I've been a bit preoccupied lately with a new $DAYJOB which has required me to be remote, let's not bury the (larger) lede: the first iteration of the Firefox/SpiderMonkeyppc64le
JIT is being evaluated by Mozilla to determine if the changes are acceptable. Please don't spam the Bugzilla entry with drive-by comments, but if you'd like to observe its progress, you can follow along in bug 1860412.
If you'd like to give it a shot as well, then apply the new patches numerically and build as we did for Firefox 115, using the .mozconfigs from Firefox 105. For your convenience the JIT patch set already includes the PGO-LTO and WebRTC fixes for that version. If you don't want to roll your own browser (though I highly recommend it), then Dan Horák has you covered with a copr build for Fedora users. However, I don't intend to backport POWER8 or optimizing Wasm support to 115ESR; future work will be done on trunk, assuming Mozilla is fine with the existing changes. Do not post bugs with the ESR JIT to bug 1860412.
Apart from that, the other Firefox news is anticlimatic: Firefox 119 (I did a test build of Fx118 but hadn't tested enough to post about it) builds fine with the WebRTC patch from Fx116 (or --disable-webrtc in your .mozconfig), the PGO-LTO patch from Fx117 and the .mozconfigs from Firefox 105.