This is was done using BT5R1 KDE 32bit
When I updated firefox, Firesheep was no longer supported on the new platform.
Well to today I'm going to show you how to get around that and make firesheep work on all platforms:

First lets download firesheep: git clone https://github.com/codebutler/firesheep.git
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# Before we do any thing we need to change some stuff FIRST! #
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First we need to change the install.rdf
go to firesheep/xpi
open the install.rdf with any text editor.
scroll down to em:minVersion>3.6.10</em:minVersion>
<em:maxVersion>3.6.*</em:maxVersion>
change to what version you are running in firefox.
<em:minVersion>5.0.0</em:minVersion> << this will be your current version
<em:maxVersion>7.0.1*</em:maxVersion> <<this is firefox current version
save it.

Before we do the git submodule update --init we need to change some stuff.
open up firesheep/.git/config and .gitmodule << both of these files are hidden.
open both files with your text editor and change to>> url = git://github.com/joyent/http-parser
Save it.

Now we can do the git submodule update.

cd firesheep
git submodule update --init

Next to compile Firesheep Ubuntu 10.04 or 10.10 we need some packages installed.
sudo apt-get install autoconf libtool libpcap-dev libboost-all-dev libhal-dev xulrunner-1.9.2-dev

Next run ./autogen.sh && make and hoplfully you'll don't get any errors

If everthing went ok we should get a build folder (firesheep/build/ firesheep.xpi)

add "firesheep.xpi" to your add-ons