On facebook.com, there are many "live search" fields where you can type in things such as a friend's name, and facebook will display a live list of results.
However, the text field has a class of "typeahead_placeholder" which gets blocked because one of the filtered items in EasyElement is "facebook.com#ad_*". It took me a long time to figure this one out. I just thought Firefox couldn't handle the live search fields correctly. Disabling this filter item allowed all the live search text fields to start working again, however.
Do you think you could remove this item from the filter list?