Zapata, I also never knew there was a new tab button that can be put into the bar! Thank you for mentioning that! For anyone that is curious, here's a screenshot of what my actual Firefox UI looks like right now, this is not a mockup. I think this pr...
According to this bug https://bugzilla.mozilla.org/show_bug.cgi?id=1914451 the original plan was to have the new tab button at the top but they moved it to the bottom for the time being, so it sounds like they might actually do this!
I found another 2 duplicates for for this, maybe combine them all? https://connect.mozilla.org/t5/ideas/vertical-tabs-on-the-right-and-in-reversed-order/idi-p/93367and also this one https://connect.mozilla.org/t5/ideas/open-new-tabs-in-inverse-order/...
Option to put the new tab button at the top has already been requested a couple of times on Mozilla Connect https://connect.mozilla.org/t5/ideas/in-vertical-tabs-add-an-option-to-open-new-tabs-at-the-top-of/idi-p/88898