There's no built-in way to open an unrelated new tab next to the current tab. However, there do appear to be a couple of add-ons for that. I haven't tried either of these myself:

• Open Tabs Next to Current: https://addons.mozilla.org/firefox/addon/open-tabs-next-to-current/
• New Tab Beside: https://addons.mozilla.org/firefox/addon/new-tab-beside/

Update for Firefox 61

There's now a built-in preference for this:

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

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

(3) Double-click the browser.tabs.insertAfterCurrent preference to switch the value from false to true

I knew it! I knew it! The evidence is in, Hamlet is smarter than firefox!

I lost all my addons in the big 60.x.xx update, so I'm going to try to live without any addons from here on out, 'cause I'll eventually loose their functionality again, and that hurts too much.

Okay, hang on... Okay, I added the second addon linked. Looks like it will do what I needed. (Better to have love and lost, than never loved at all.)

Thank you!

Hi, if need further help ask. If this Solution Solved the issue Please mark as such so others can find it.

Thank you! I hope I can remember that for fx61. However, after enabling this functionality, what is the procedure for opening the tab next to current one? Is there a drop down menu or what?

Hi hamlet_jones, the new setting is binary:

• with false => new tab ("+" button or Ctrl+t) always opens at the end of the tab bar (traditional behavior)
• with true => new tab ("+" button or Ctrl+t) always opens next to the current tab (replicating a TabMixPlus behavior)

The setting doesn't give you the flexibility to choose on a case-by-case basis, so you would still need an add-on to have that.

jscher2000 said

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Update for Firefox 61

There's now a built-in preference for this:

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

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

(3) Double-click the browser.tabs.insertAfterCurrent preference to switch the value from false to true

OK... I read about that somewhere else and tried it, but it didn't help. Ctrl-T still gives me a new tab at the end of the tab-list...

PS: Suddenly I can't find a way to post new questions. I can only read existing questions - like this one, I am replying to...!?

Hi Hero27, the "Ask a Question" link at the top of each page changed to "Get Community Support".

Could you test the preference change in Firefox's Safe Mode? In its Safe Mode, Firefox temporarily deactivates extensions, hardware acceleration, userChrome.css / userContent.css, and some other advanced features to help you assess whether these are causing the problem.

If Firefox is not running: Hold down the Shift key when starting Firefox. (On Mac, hold down the option/alt key instead of the Shift key.)

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" Help button > Restart with Add-ons Disabled
• (menu bar) Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any improvement?

jscher2000 said

Hi Hero27, the "Ask a Question" link at the top of each page changed to "Get Community Support". Could you test the preference change in Firefox's Safe Mode? Any improvement?

Thank you for your reply!

Starting FF without add-ons solves THAT. But FF without add-ons is quite useless to me... So I guess I will have to find 1-2 add-ons for FF Quantum (Webextensions) to implement: 1: Ctrl-T opens a new tab next to the present - and - 2: Another key-combination duplicates the current tab next to the present.

Now, "Get Community Support", DOES lead to a "None of these solve my problem"-button which makes it possible to post a question. But I couldn't find that button yesterday...

Hero27 said

I guess I will have to find 1-2 add-ons for FF Quantum (Webextensions) to implement: 1: Ctrl-T opens a new tab next to the present - and -
2: Another key-combination duplicates the current tab next to the present.

For #1, use the solution to this thread. If one of your current extensions is interfering, track it down and remove or reconfigure it.

For #2, there might be one.

Now I have tried these:

Open Tabs Next to Current: https://addons.mozilla.org/firefox/addon/open-tabs-next-to-current/ New Tab Beside: https://addons.mozilla.org/firefox/addon/new-tab-beside/

But none of them work!

Should I set the 2 'about:config' settings (containing 'insert') to 'false' in order for the add-ons above to work?? That seems too far out to even consider...

Mozilla forcing Webextensions on me has become one of the most painful and tiresome and complex computer problems I have ever experienced!!!

Henrik

Hi Henrik, I suggest not using any extensions to open every new tab next to the current one now that there is a built-in preference for that exact behavior. Also, don't enable multiple extensions that are supposed to do the same thing without knowing that they are compatible with one another, since they may conflict.

I DID try disabling all 'new tab' related add-ons, and restart FF, before I concluded that Ctrl-T still gave me new tabs at the end of the tabs list!

Hero27 said

I DID try disabling all 'new tab' related add-ons, and restart FF, before I concluded that Ctrl-T still gave me new tabs at the end of the tabs list!

OK... Now I have opened an issue on this here: https://github.com/Croydon/vertical-tabs-reloaded/issues/203