Boons and Banes of Firefox and Thunderbird
Among the many boons of Firefox and Thunderbird are the powerful keyboard shortcuts; among the banes - trying to remember them.
Now you don't have to. Thanks to the selfless work of Leslie Franke, you can download two indispensable cheatsheets, which conveniently fit all the main commands on one page each. There's one for Firefox and another for Thunderbird; both are available as HTML or PDF. Thanks, Leslie.