Earlier quoted context omitted.
Multi-process is being tested in Firefox Beta right now, according to https://wiki.mozilla.org/Electrolysis#Schedule .
While some progress is being made, it worries me that it's taking so long to get this functionality into the release versions. I'm not suggesting it should be rushed out, of course. But the Electrolysis efforts date back to 2009, if not earlier. That's a long time to make users wait!
[1] https://developer.mozilla.org/en-US/Add-ons/Working_with_mul...