Let's see if this is what you want:
If so, you can find the dev download at:
https://github.com/Wolfsblvt/highlightunreadposts
If you have any small suggestions etc, you can tell, otherwise I will oben an extension topic soon.
(And what do you say about the top bar? That was my idea that it would look even cooler

)
EDIT://
As I thought over it, there isn't really a need for this to be an extension. Of course it can, but in fact the only relevant part are two parts of css code:
Code: Select all
.post.unreadpost {
padding: 0 5px;
border-left: 5px solid #693;
border-right: 5px solid #693;
}
#unread + div.post.unreadpost {
padding-top: 5px;
border-top: 5px solid #693;
}
So it is more like a style modification. Every style can display unread posts the way they want, the markup exists. So for prosilver there was just the orange symbol image thing on the top left edge of the post.
Dunno if this is enough to name this an extension. What do you think?