Hi katekay,

Thank you for contacting Mozilla support. To better investigate what is causing this to happen, can you please provide a screenshot of where you are clicking and provide the following information:

• Where exactly are you clicking to open all of them at once?
• Does this occur in Safe Mode as well? []Diagnose Firefox issues using Troubleshoot Mode

Other useful articles for your issue: Customize your Firefox New Tab page Remove a toolbar that has taken over your Firefox search or home page [The thumbnails on the new tab page are missing - how to get them back]

Please let Mozilla Support know how this goes, and with that requested information we can provide more specific steps.

Looking forward to your reply!

Is the problem with the Most Visited "smart bookmark" with the blue folder icon, that usually appears on the Bookmarks Toolbar?

Of course Firefox should only open ALL of the sites if you choose the item at the bottom, Open All in Tabs. If all sites are opened just clicking the bookmark to expand the list, something is definitely broken.

Have you noticed this problem with any other folders on the Bookmarks Toolbar? If you don't have any other folders on the toolbar, we could test that later.

The above suggestion to test in Firefox's Safe Mode is a good first thing to try in this case, to see whether an extension might be modifying how your bookmarks work.

Make sure that you left-click that folder and not middle-click with the mouse wheel.

Quote: my usual settings seem to have been removed. How can I restore them

Could you elaborate on this to explain what you mean with this?

What settings did you lose?

Actually, I just discovered that if you "middle-click" a folder on the bookmarks toolbar (click the scroll wheel on it) then all of the pages will open in new tabs immediately. I assume you are not doing that intentionally. Have you noticed any other strange mouse behavior?

As usual, cor-el is way ahead of me!

Thank you to all for suggestions. It seems to have sorted itself out, though I'm not sure what I did.

Kate