In Firefox's default horizontal tab bar, always open a tab at the end (right hand side)

[Waterford-Wanderer]

I apologise in advance for being ignorant and stupid, but is there an easy or quick way to retain the behaviour I had already set in the "about:config" of Firefox, where any new or child tab always opens at the end (right hand side) of Firefox's default horizontal tab bar (when Sidebery is active) ?

[albino1]

Take a look at Settings -> Tabs -> Position of new tab

[Waterford-Wanderer]

Thank you !

[ I changed Settings -> Tabs -> Position of new tab -> Place New Tab (general rule) to "panel end"
and that seems to have restored things so that any new or child tab always opens at the end (right hand side) of Firefox's default horizontal tab bar (when Sidebery is active) ]