[Duplicate/Locked] Lightning as start page in "Portable" Thunderbird

Sorry for previous post. I'm trying to get lightning to come up as the start page in Portable Thunderbird. Shortcuts work differently than in the non-portable version. There must be an easy way to do this. It is eluding me. Any help would be appreciated.

[This topic has been locked by moderator JTH. Posting the same thing more than once is against the forum guidelines and is considered bad form in all online forums.]