Hello enginestar,

Maybe you'd like to give this add-on a try and see if it'll do what you want :

https://addons.mozilla.org/en-US/firefox/addon/new-tab-beside/

Or this one :

https://addons.mozilla.org/en-US/firefox/addon/open-tabs-next-to-current/

Any good  ?

The latest update to FF Dev Edition seems to have broken both of those extensions and so anytime I use ctrl-T, I get a new tab at the very end.

My workaround for the moment is to middle-click on a link in the preceding page which does open a new tab just next to it. Then ctrl-D and change the url to the one I want.

My bad (rtfm).

New Tab Beside's hotkeys don't include ctrl-T. Rather you use:

- New Tab (Ctrl/Command+Shift+1) - Duplicate Tab (Ctrl/Command+Shift+2)

These do work.

Hmm, if Ctrl+t is the important one rather than right-click, try the built-in preference. I'll describe both for the sake of completeness:

(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 insert and pause while the list is filtered

(3) By default, links in a tab will open next to the tab. This older preference is called browser.tabs.insertRelatedAfterCurrent and if it's bolded and set to false, double-click it to restore the default value of true

(4) By default, other new tabs open at the end of the bar. To change that, double-click the newer browser.tabs.insertAfterCurrent preference to change its value from false to true (note: setting #4 to true overrides setting #3 to false) (note: this is available in Firefox 61+, so not in Firefox 60 ESR)

Does that do what you need, or are there still some issues to sort out?

You're right - I'd forgotten about the about:config value. Sorry for the trouble and thanks for the help.