Firefox 66 on POWER

Firefox 66 builds out of the box as Firefox 65 did. In addition, as part of the porting effort, I'm running occasional check builds roughly weekly to make sure we intercept issues on nightly before they get into beta and require a higher threshold of approval for patches. So far no major issues and Mozilla continues to be very amenable to getting the occasional fixes in promptly.

The biggest change in Fx66 is the number of default content processes in this release has jumped from 4 to 8. This is good news on our massively parallel multicore systems generally, but it's possible that the differing memory usage may be what tickles that harmless kernel assertion (though on the other hand, setting it back down to 4 didn't eliminate them completely). If you're on Fedora as I am or another distro that elevates kernel warnings to notifications, you'll probably want to turn off those system notifications until your distro's kernel gets the fix in it; see that article for details.