From what I can see about this plugin, it uses shortcode to mark the footnote. So, it is not dependent on other plugins to work. Problem is that bbPress doesn’t support shortcodes by default. When my plugin is active, it enables shortcodes for the bbPress topics and replies, because it needs that for the BBCodes support (40+ new shortcodes). So, while my plugin is active, all shortcodes will work for bbPress topics and replies.
But, my plugin adds shortcode with the same name ‘note’, and to use Footnotes plugin, you need to disable ‘note’ BBCode from my plugin settings. After that, it works (I have tested). But, Footnotes plugin doesn’t have support for bbPress content, so the option to add all footnotes at the end of the content will not work, footnotes hover works.
Thanks for your prompt response and for teaching me that bbPress does not support shortcodes! I really LIKE Easy Footnotes because it works and looks “scholarly,” exactly as I want on standard WP pages (example: http://forums.typeheritage.com/measurement/).
So I must consider the trade-off of sacrificing *printable* footnotes for the convenience of hover tool-tips.
I am sure that with some minor custom coding, it can be made to support printing of notes under the topic or reply. You should also contact plugin author, maybe he is willing to add proper bbPress support.