Show sender of e-mail in thunderbird message pane

Thunderbird shows in the message pane the "From".

I get also e-mails, where the senders are using the same name in From, but have
different entries in the sender tag.

To see also the sender in the Messages pane, you have to activate it in the config

Edit -> Preferences -> Advanced 
Here the tab General contains a button "Config Editor"

Search for
and set it to true.
After a restart, thunderbird shows also the sender in the message pane.