I don't usually get a new tab when I restore the previous session -- unless Firefox just updated, which actually is pretty often. But you are getting a new tab in the middle of the tabs instead of at the end?

I'm not sure what is causing that. Was the last active tab a pinned tab (Pinned Tabs - keep favorite websites open and just a click away)?

Note: your second URL has a typo, extra period after .org which messes up the page.

I don't usually get a new tab when I restore the previous session -- unless Firefox just updated, which actually is pretty often. But you are getting a new tab in the middle of the tabs instead of at the end? I'm not sure what is causing that. Was the last active tab a pinned tab (Pinned Tabs - keep favorite websites open and just a click away)? Note: your second URL has a typo, extra period after .org which messes up the page.

When Firefox is open, and I restart/relaunch, instead of opening to the same tab, the current open tab in use, Firefox opens to the tab to the "right" of the tab that was active/being used before the relaunch.

Furthermore, if I closed the current active tab in use, Firefox will open/select the tab to the right, even if it is not an active tab. Since session tabs are conventionally opened from left to right, I would expect the browser to select the tab to the left, particularly if it is an active tab.

Perhaps you could explain that purpose of designing things that way. I don't understand the logic.

I believe the "Select After Closing Current" addon is meant to correct all this, but setting it up is a bit confusing, so maybe I'm not doing it right.

Note: your second URL has a typo, extra period after .org which messes up the page.

noel_envode, perhaps the current tab closing logic is based on the number of required operations?

If you have 8 tabs open and close tab#4, then currently the following happens: The former tabs 5 to 8 get shifted one place to the left.

There is however no change in tab focus. You were on tab#4 and still are.

Displaying the tab to the left of the closed tab would involve this same operation, but with the additional step of shifting browser focus to tab#3 after the closure.

So maybe that is why? That said, if people think it makes more sense to move browser focus to tab#3 after closing tab#4, then of course there is nothing wrong with giving them that option.