After digging deep inside the bowels of Freeplane OSGI resource loading and the flyingsaucer resource loading I've pieced together a solution to actually be able to display the built-in Freeplane items in the "browser"
The action list is redesigned, the priorities are displayed as icons, the done and incomplete items are displayed as icons. The contexts that have icons defined to them are replaced with their corresponding icons.
Right now it's working and is a known waste of good memory (should reuse icons) #43
The flyingsaucer HTML renderer was updated to it's last version.
Solved issues:
#42 The checkboxes didn't display properly under some OS-es
#41 Multi-level projects with HTML content are not rendered properly
#40 Fixed HTML entity handling, while keeping the formatted strings intact
