If you use ThunderBrowse on Postbox, you might notice that it doesn’t work anymore and the tabs build is just as broken.
Here’s what happened: Postbox developers changed how the message pane is displayed. This seems to be a reoccurring theme in Thunderbird (and messenger in general) development land.
Anyways, I fixed the problem in ThunderBrowse 3.2.6.5 and for good measure, I threw in some context based items into the special context menu for links. I’ve also included the fix in the new tabs build. TB3 Tabs for Postbox is not possible at the moment. Do not attempt to install the tabs build on Postbox. The registration flag is either not the same or not available (I didn’t have time to check).
I’ve uploaded the new tabs build (the link is the same as before) and I just uploaded 3.2.6.5 to AMO. I also fixed a small wizard bug for Postbox if you used a sandboxed copy.