Shortcuts: sites you save OR visit – why can't I choose sites I save only?
This is a minor issue, but it's really annoying me. I like having certain pages pinned on the page that opens when I open a new tab; it's easier than always having to search through my many bookmarks for pages I use every day. But I find it really annoying and unhelpful – and also embarrassing, if another person is there – that Firefox only allows me to do this if I also allow it to display sites I've visited. The two should be completely separate in my opinion, like on Chrome. I can delete individual sites, but they're just replaced with other, even less relevant ones. So now I have a blank, useless new tab page, instead of a helpful one that shows me the sites I need to get to, because I don't want to risk a coworker, friend, or family member randomly seeing whatever sites I may have visited once or twice months ago. (This doesn't have to be extreme (porn, etc) to be embarrassing; I don't necessarily want people to see that I've been shopping for jewelry or hair dye or whatever.) It's just unprofessional and unnecessary. Thanks for fielding my complaint.
Why don't you just rearrange those shortcuts, or pin your helpful sites? See Customize items on your Firefox New Tab page.
This works only if I fill the whole row(s) with pinned sites – otherwise the random ones continue to pop up. It is an acceptable solution, but it's still inelegant. Adding a pin manually (instead of waiting for it to show up) is only possible by selecting "edit" from the pin menu, and then replacing both the url and name, which is counter-intuitive enough that I didn't find it for a while.