Rated 5 out of 5 stars

le dotancohen ar Iúil 26, 2011 · buan-nasc

As good as this extension is, it is rarely updated when new Thunderbird versions are released. Now that Thunderbird 5 is out we can start using Thunderbird Conversations (adds Gmail-like threading) which actually incorporates a Slideshow-like feature. So for those sick of waiting for Slideshow to be updated, go check out Conversations:
https://addons.mozilla.org/en-US/thunderbird/addon/gmail-conversation-view/