browser.tabs.insertAfterCurrent is a treasure inside about:config of Firefox (and LibreWolf for that matter). Instead of opening new tabs at the end, it opens them right next to the current tab so you can go back to the last tab instantly without scrolling through a long tab list! I believe this should be the default behaviour in every browser.

Unfortunately, too few users are aware it even exists.

I suggest you add this as a checkbox in the graphical about:preferences menu.