[OT] Mozilla Thunderbird

[CrypticMetaphor]

I'm using Thunderbird, but it's pretty much the only newsreader I've 
ever had so can't really compare it with others. But I use the following 
extensions to improve my experience:

QuoteCollapse:
https://addons.mozilla.org/en-US/thunderbird/addon/347/

Not directly related with newsreading but still useful.
https://addons.mozilla.org/en-US/thunderbird/addon/12581/

I use other extensions as well but they are not newsreading related.