[Daniel Terhorst]

For those who want a fixed size, adding a body entry to the Stylish script, like so:

@-moz-document domain("stevepavlina.com")
{
   body {
      width: 800px;
   }

   #content {
      margin-left: 0px !important;
   } 
   
   #navigation {
      display: none;
   }
}

might do the trick. Adjust as you wish. Posts that are too wide extend beyond the specified borders.

I haven't tried it everywhere in the forum, but it seems workable at a shallow glance.

I don't use Greasemonkey, so no guarantees, but I imagine something similar to the following line might work:

document.body.width = '800px';

-- Daniel Terhorst