I have managed to get adblock plus working on Diablo.

Note : Its a "hack". You will need a desktop with working adblock plus and filters installed already.

Steps :
1. Point your browser to mozilla add-ons website and install adblock plus.
2. create a folder, details :
cd /home/user/.mozilla/microb
mkdir adblockplus

3. copy patterns.ini from your desktop, if windows, its at Documents and Settings/YOURUSERNAME/Application Data/Mozilla/Profiles/YOURPROFILECODE/adblockplus/ into /home/user/.mozilla/microb/adblockplus

4. I did change the about:config entry for
extensions.adblockplus.checkedtoolbar to true.
But it didn't seem to have any effect. No ADP icon on the toolbar.

Please refine this simple howto if you have more details. Thank you.