I like Zen Browser, but the recent addition of window sync completely broke tab names when you disable it. I like having different tabs in different windows, so I'm on Waterfox for now. I filed a bug report and they claimed to fix it, but I tested the next release and it's still there. I know they'll fix it eventually, but beyond that I'm worried they'll break something else in the future. As an Arch user I thought that wouldn't bother me, but for this I guess it does.