So, I tried to be smarter as smart and I moved the default thunderbird location from "$HOME/.thunderbird" to "$HOME/somewhere/else/thunderbird". I will call the second path "
cp -r --preserve=timestamp,mode
Afterwards you have to adapt some files since the old path is stored there as references.
/.thunderbird grep -lr 'path\/to\/thunderbird' *
for each files
Now start your thunderbird for the first time and everything should be fine.