A very useful extension available for Firefox as well as Chrome.

It would be excellent if the author add temporary disable feature to it.

Nice job!

Really helpful. Gmail default order sucks

Does what it says! I wish this were a built-in feature, but I'm glad this addon is here to offer it.

Very nice add-on. It took very little time to get used to it, but the reverse order makes more sense and is consistent with the inbox ordering. Impressed that this is just CSS.

This add-on got deleted when setting up my new computer. I forgot the name of this add-on but was so happy to find it again. Using Gmail without this add-on is a huge pain in the ....

This add-on makes Gmail more logical and useful. Thanks so much to the folks who made this add-on.

Much more readable conversation view. Highly recommended.

Beautiful! It has solved my problem in an extremely simple way!

Fantastic, just what I and surely many others have been waiting for. Sorting from newest to oldest is so much easier to use - no more scrolling to the bottom of the conversation. Should be in the gmail settings of course, but gmail/google is clearly stubborn, so a big thank you to Tomasz!

So simple, so brilliant!
Firstly: Especially useful with splitted pane (from Labs), so as you see threads as newest on the top.
Secondly: e-mail nature seems to be appending new content at the top of previous content, so reading is reversed.