I finally figured out why Firefox kept warning me about opening too many tabs at once: this command is the first option on the pop up menu when I click and hold a moment too long on a folder that is part of my bookmarks toolbar (some of these have dozens of bookmarks) 'Open all in tabs' this is on my Windows 10 PC using Firefox beta. Is this a command I can hide/delete/inactivate? I'm quite certain I've never wanted to do this and probably will never want to do it, and now on a machine where I use a mouse with right click it is disturbingly easy to click this accidentally. I want to disable the command entirely. I did check about:config and saw nothing obviously relevant.