Hi there

we have received your message. yes you have unwanted promotional activities with your Firefox Thunderbird software.

Greatings Firefox volunteer.

first try to remove the software in a normal way. Switch off all your tools temporarily. If this does not help you can try a light system recovery.

try removing your software with the option programs and components in your windows menu options.

try to find a good uninstall program where you can remove unwanted programs that you do not know about. This could also have become a cause.

try to see if you have a good antivirus on your computer or if there is not an unknown installed or several. Antivirus programs are also system resource eaters.

Try chkdsk go to local disk. use the properties option. click on tools use the check scan disc option.

If none of these help mail back safely. we are here to help you.

regards Firefox volunteer.

This problem occurred after I did a clean install of Windows 10 V1809. I reinstalled Thunderbird software and my previous Thunderbird Profiles (the profiles were made while using Windows 7). When the Home Page problem occurred I deleted Thunderbird Software using Revo Uninstaller Pro. I did this three times and still have the same problem

In Tools/Options/General, uncheck the box for 'Thunderbird Start Page'.

The Start Page and Home Page are two differ screens. See attachment for a picture of the Home Page.

TB starts with the same window setup that was shown when it was last closed, but if for some reason it's not working properly, it may help to delete or rename session.json from the profile (Help/Troubleshooting Information, click Open Folder, close TB, delete or rename the file, restart TB).

http://kb.mozillazine.org/Toolbar_or_windows_layout_not_working

I tried your above suggestion but it did not correct the Home Page problem. Thank for the suggestion.

Try some of the other suggestions in the kb article, beginning with starting TB in safe mode, to e.g. check for a broken layout (corrupted xulstore.json).