Debian GNU/LInux, bitcoin 0.3.14, google chrome 7.0.517.41
port 8333
yes, on same computer
because the error "Error fetching wallet data." occurs after stopping the demon then I think communication with the plugin is established.
Port 8333 should be the P2P port. The RPC interface listens on 8332 locally (127.0.0.1). If you changed that in the extension options, try changing it back. What you are describing sounds like it is connecting to something, but either authentication fails or it's not getting a response it recognizes.
Yes, theese been problem with port number, sorry.
Maybe do the checking by running some command like getinfo and if it did not work show a more verbose error?
Searching for addresses on the page will be implemented?