I wish there was a way to just have the app ignore the back button when you’re on the posts page.

I agree. I’m a pretty happy Firefox user. I am not a power-user of tabs anyway, I try to keep my open tabs to a minimum.

This is just a list of browsers with apparently good tab management.

I believe India is following your approach, asking ISPs to block certain websites, mainly porn. Or at least, they were. I’m not sure what else they’re planning now.