Thunderbird Portable Splash-screen disable
- Navigate on your hard drive or USB Stick with the Windows Explorer is stored in the folder where the portable Thunderbird Version.
- In the folder "Thunderbird portable", see the sub-folder "Other" and "Sources". You will have to copy the file "Thunderbird portable.ini" from the folder "Sources".
- Navigate back to the top of the folder "Thunderbird portable", in the file "ThunderbirdPortable.exe" is. Paste the copied file here.
- Now open the just pasted "Thunderbird portable.ini"file and change the entry "disable splash screen=false" to "disable splash screen=true". Then store the file.

Portable without Splash Screen
Read also, how to you E-Mails in Thunderbird to export and import.