Hi, this should work : https://addons.mozilla.org/firefox/addon/open-tabs-next-to-current/

Next to current is what I'm trying to cure -- the stupid things pile up in the middle of the tab bar instead of on the far right in order.

https://addons.mozilla.org/firefox/addon/always-right/

And that one opens adjacent to the current tab -- which most of the time is pinned on the far left, so the tab opens somewhere to the left of all the others and I have to search for it.

Far right. It used to be possible.

Firefox's native behavior is:

• Open related tabs next to current (e.g., from a link in the current tab)
• Open new/unrelated tabs at the end of the bar

There are now preferences to manage both of those:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful or accepting the risk.

(2) In the search box above the list, type or paste curr and pause while the list is filtered

(3) Then set:

Open Related Tabs Next to Current, Others at the End of the Bar:

browser.tabs.insertAfterCurrent = false (default) browser.tabs.insertRelatedAfterCurrent = true (default)

Open All Tabs Next to Current

browser.tabs.insertAfterCurrent => true browser.tabs.insertRelatedAfterCurrent = whatever

Open All Tabs at the End of the Bar

browser.tabs.insertAfterCurrent = false (default) browser.tabs.insertRelatedAfterCurrent => false

To switch a boolean-type preference between true and false, double-click it.

Thanks. I suspected that the solution was somewhere in the forest of config setings, but the search terms are an art in themselves.