Recently I've found that hitting "enter" after typing something into the address bar in Firefox causes it (search results, whatever) to open in a new window. I'm a fast typist but also a bit sloppy, and what's happening is that I'm hitting enter while my finger is still on the "shift" key. It's incredibly frustrating, and also seems to be a relatively new development: I've been using Firefox for years and don't recall ever encountering this until very recently. I will never, ever actually want to use this particular shortcut in my life, EVER, so what can I do to disable it?

I also recently had to install an add-on to disable the detach-and-tear option for tabs, which is something else (accidentally moving tabs to new windows when clicking on them) that only became a problem for me very recently. That has apparently been a problem for other people for quite some time, though, so maybe I had a long-ago-installed extension that prevented it, that was disabled post-FF56? Whatever the case, Firefox performance has dramatically improved with the new version, but frustrations like these continue to crop up.