Invisible scrollbars is probably the number one reason why I scream at the computer when I have to use Chrome instead of Firefox. At some point, Chrome removed the option to make the scrollbars visible. The UX people are completely insane.

Case in point: I tried to install ChromeOS Flex on one of my laptops. After booting from the USB drive, the installer went through a series of screens. On the 3rd or 4th screen, it would hang and make no progress. I rebooted and re-installed. Same thing. Tried a third time. Same thing.

On the 4th try, I accidentally discovered that the dialog box had an invisible scrollbar. WTF. If I two-finger scrolled on the dialog box after moving the mouse pointer into it, it would reveal some additional text on the bottom which indicated that it was not hanging but doing some work.

After I had finished installing ChromeOS, I discovered ChromeOS has a Settings option to "always display scrollbar", but the Chrome browser completely ignores that flag. Awesome. I blew away ChromeOS Flex on my laptop.