Right click a blank part of the Tab bar and then click "Customize". In the panel which opens, click the button called "Restore Default Set".

So I can't add my own tabs (such as my RSS feeds button) to the tabs bar without moving the open new tab button to the right? That's not very useful. :-(

That's not what you asked the first time.

If you want to rearrange the layout to your own personal taste afterwards, then leave the panel open and drag elements such as toolbars and buttons and place them wherever you wish.

You can also drag anything out of that panel and place it where you want.

Similarly, drag elements you don't want into it. They will remain there in case you change your mind later and want them back.

I apologize, I did not know that they were two different questions. Being unfamiliar with what my options ARE, I couldn't know what exactly to ask for.

Thank you for the response. This is exactly what I was looking for.

You're welcome.

Could you please click the "Solved It" button next to the post which solved the problem for you? This will help others searching for a solution to the same question.

Thanks.

I'm assuming your answer was for FF4, because when I try this solution in FF5, nothing happens. The Add Tab button stays to the far right, and nowhere else in the customize toolbar area can I find the ability to put it back next to the last active tab (which is where I want it).

Thanks for your help if you know a solution!

@Brianinseattle It works for FF5. When you have the Customize box open and drag the New Tab button over on your tool bar, it LOOKS like it doesn't move, but as soon as you close the Customize box it does, in fact, appear correctly on the toolbar. Kind of weird (I thought it hadn't worked at first as well.)

@Brianinseattle

Because of tabs-on-top, I don't think you will see the old behavior; furthermore, you may even lose the new tab button if you place it to the left of an extension added toolbar button, such as the "Tab Counter" extension.

The area between tabs and right side is now a desolate region as far as Firefox is concerned given back to the title bar except for the ability to double-click when you have chosen to display a menu bar and/or chose tabs-on-bottom.

You can play with a tab separator, or space but if you do not allow horizontal scrolling of tabs bar you risk losing the new tab button, and a separator is so hard to remove, you have to point to the separator with the ring finger not the index finger to remove. But for me the New Tab button occupies too much space for me to consider having it on the tabs bar at all.