A random feature I didn't know for too long is long pressing the back button, which opens a menu containig the last few locations. Typically that helps with sits who hijack the back button. Works also on desktop.
What I'd love is a crowdsourced database for known back button hijackers in e.g. Firefox: If too many people report a site as being broken that way, the back button API could be made opt-in for everybody in the site settings.