I made a huge mistake, I was trying to make Thunderbird view larger, now it's much to large to be functional or to make changes or go back to original settings. Here's what happened.

I went into "advanced settings" and changed layout.css.dev.Pixels.Per.Px the size is to large and now I can not view or make changes to Thunderbird. I tried deleting Thunderbird and re-installing it but no luck, the re-install has same large scale issue.