Maybe we can start listing the extensions which work/don't work in this thread?
Here's my list (PW3). Some differences indicated in brackets.
Working:- Kterm (top command not working. Use htop from USB network instead)
- Leafpad
- Screen Savers Hack
- Gargoyle (Game images look smaller)
- Koreader
- Kindle Explorer (small menu icons)
- Eboard Chess (tiny menu icons)
- RGB Paint (tiny menu icons)
- Draw
- Power Button
Not working:- Task Warrior (some library path issue. Could be fixed)
- Most Amazon "active content" apps
I will add to the above as I check more extensions.