I've also been using Nightly since about 2 months ago, when I noticed how fast it became. However, it does have its share of glitches. For instance switching between tabs with C-S-Tab, doesn't take me to the previous tab, but jumps seemingly at random (this doesn't always happen but it does happen often enough to be annoying).

Same here. I remember trying Nightly in 2010 and having be super unstable. Coming back after years on Google Chrome, Nightly feels super stable and responsive.

I do get the occasional rendering issue, but that's my only nitpick.