Quickly see the explanation for a XKCD comic using data from the explainxkcd.com forum.When viewing a comic at xkcd.com, you can click on this extension and get a detailed explanation using data from the forum explainxkcd.com. This way, you don't have to leave the current page.
This extension also integrates with my extension XKCD New Tab to show you explanations in the built-in XKCD viewer.