'''Note: '''Please read my reply to the post, below, for an update. I like to have new tabs open at the end of my tab stream so that each new tab opens in consecutive order. This is only inconvenient when I have a lot of tabs and need to scroll to the end for the latest. Because I was working with a lot of tabs today I toggled the following to "true" in about:config — browser.tabs.insertAfterCurrent = true browser.tabs.insertRelatedAfterCurrent = true The issue I'm having is that after toggling back to '''false''', new tabs continue to open after the current tab, rather than at the end as before. I'm not clear on the difference between related and unrelated, so I've experimented toggling one on, one off and neither or both but for some reason the behavior continues to default to opening new tabs after current in each case. I have also tried restarting both Firefox and the computer, but this has not had any effect, either. I have included a screen shot of the present settings and behavior.