Download latest Flock Browser from here

Then Extract it to the home say to a folder ~/flock

The move it to /usr/local/ by

[localhost@dbbrtdb ~/] # mv flock/ /usr/local/

[localhost@dbbrtdb ~/] # ln -s /usr/local/flock/flock /usr/bin/flock

[localhost@dbbrtdb ~/] # ln -s /usr/lib/mozilla/plugins/* /usr/local/flock/plugins/

Then you can create the menu shortcut icons a/where you want.

Enjoy