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|User since||August 23, 2012|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
First of all, PLEASE update this extension! It's great and superuseful.
Otherwise here's how you get this working. Download an addon/extension here called "Nightly Tester Tools" - after its installed, type in your URL bar about:config; then in the search box look for a key called "nightly.disablecheckcompatibility" right click it and set the value to True. Then restart. Now come back to the DP extension and then install away!