Q: How can I close all the tabs at once? A: Right click on the first tab

    select 'Close other tabs'

Q: I tried closing and reopening Thunderbird but it did not help. A : That's because the session remembered your Thunderbird selections when it closed and then reopened using those same session selections.

db999 said

I was trying to move the contents from one folder to another account but instead it opened all the emails in separate tabs. How can I close all the tabs at once? I tried closing and reopening Thunderbird but it did not help.

Thanks, Although your answer did not tell me how to change the session selections, I found that after I closed down the computer and booted it, Thunderbird had cleared up the mess. Is that the easiest way to change the session selections?

I was wrong. I was looking at the wrong computer. I still have all 308 tabs open so I do need to know how to change the session selections. I'm afraid that Mozilla help was of no use.

Ok lets try this:

First close all those tabs.

• Right click on the first tab
• select 'Close other tabs'

Then make hidden files and folders visible:

• http://kb.mozillazine.org/Show_hidden_files_and_folders

In Thunderbird:

• Help > Troubleshooting Information
• click on 'show Folder' button

a window opens showing contents of profile folder.

• Close Thunderbird now - this is important.
• look for and delete this file: session.json
• Restart Thunderbird.

Report back on results.

Thanks, It appears that it was enough to click on the first tab and select Close Other Tabs to solve my immediate problem. I will keep the rest of your instructions for some future problem. Thanks again for your patience and quick support.