It's a shame that Personas has got retired.
Since I have Firefox Color my Firefox isn't working right anymore. It lags most of the time. Some pages (most of them are pages with shops, like amazon et al) aren't loading or crashing while loading. To avoid other reasons I tried it with several browsers (even the bad IE) and nowhere I have these errors I'm getting on Firefox since I'm using FF Color. And of course I tested it when FF Color was deactivated or removed. Then FF worked proper, like always before and with Personas. So after sending this review I'll say good-bye to it and will search for alternatives. FF Color is none!