On Linux Ubuntu 8.04, pasting HTML (e.g. from Firefox) to FreeMind is broken. HTML source code appears in the node and hierarchies are not resolved correcty.
Here is a patch created against version 0.9.0-Beta-20. It's rather a hack (it lacks good code style) but it shall work.
1. Use source release freemind-src-0.9.0_Beta_20.
2. Extract files from the attached patch archive and replace existing files.
3. Build freemind from source (ant)
4. Run freemind (ant run)