This tiny page will help you whitelist (or otherwise change the blocking status of) domains in the EFF's Privacy Badger extension. It is particularly useful for bookmarklets like Instapaper's which auto-detect when they're blocked and bring you to a new page, leaving you unable to adjust the Privacy Badger settings.
Clicking the button above inserts an
<iframe> into the page that points to the domain you
typed in. Loading the <iframe> triggers Privacy
Badger's detection and lets you adjust the settings for the domain in the
control panel.