Rated 2 out of 5 stars
The extension, itself, is nicely written --but it has one problem that makes it completely unusable for me. When you click on a thread, it automatically pops the message pane up on your main window. I keep the message pane hidden, so I can see more emails. Needless to say, it's annoying to have the message pane pop open, then close it, then have it pop open again when you get to the next thread, then close it, etc.
I posted a request to fix this, or to add the ability to set this as an option, and the developer said:
"Patch is welcome. Otherwise, just don't use the extension :-)"
What a nice attitude to have.