[danappelxx]

Safari (for macOS and iOS) also has this with reader mode. Works well for most websites.

[throwanem]

Firefox in recent versions, too.

[bhrgunatha]

I've been disappointed so much with the changes to firefox UI over the last couple of years, so it's great to have something positive. Reader is a resounding success with me, given the terrible low contrast, difficult to read, web design trends over the same time span.