Talk about breaking the back button! Do a measurement on a website. Then click one of the Guide links like "Links do not have a discernible name". Page navigates away from the report to some documentation. Click back, report is gone.

I get it, it's a single page webapp. But if you do that you need to make all the simple navigations open new tabs. There is a "open link in new button" icon next to each link, but that's really not good enough.