Tabs listed in the list all tabs drop-down list are all tabs that are currently opened as tabs on the Tab bar. You may also see scroll buttons at both ends on the Tab bar if you have opened a large amount of tabs. This has nothing to do with bookmarks.

Thanks. There's a scroll button on the far right side of the tab bar (just before the "+" and drop down menu for viewing all tabs), but not on the left side. That option looks like two arrows pointing right and left. However, neither direction scrolls the tab bar. This is on a Mac.

You can delete a tab in the usual way, either via the close X on this tab or via the right-click context menu or with a middle-click with the mouse scroll wheel on this tab if you have a three button mouse.

• https://support.mozilla.org/en-US/kb/tabs-organize-websites-single-window

Since the Tab Bar doesn't scroll, there's only the drop-down display (on the far right) of pages available. On my Mac, there's no functionality available on those. Right-click (two fingers) doesn't do anything. I can open those "tabs", but not delete them.

Isn't there a close button ion the tabs?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

I'm attaching a screenshot. There's no close button.

It looks that a lot of tabs are pinned tabs because they appear at the left side of the left scroll button. Tabs listed in the area used for pinned tabs do not have a close button and need to be closed via the right-click context menu.

I don't know whether you have normal tabs because there is not enough room on the Tab bar to show them. You would have to make the Firefox window wider or unpin some tabs until at least one regular tab is visible.