Annoying new Firefox behavior

I just upgraded my version of Firefox, and now it’s doing something I don’t like. It used to be that when I opened a new tab, the new tab would appear at the far right of the tab list. Now, though, when I open a new tab, it appears immediately to the right of the tab I’m on. I liked it better the old way, and would like to switch it back, but I can’t find any setting for that. Help, please?

Change your about:config setting, as explained here: New tabs do not appear to the right of the last tab | Firefox Help

Go into about:config, and set browser.tabs.insertRelatedAfterCurrent to False.

Thanks, it looks like that fixed it.