Many computers already have Java installed (type "java -version" in a shell or DOS window). This program works with Java 1.4 or newer. You can upgrade or install Java from Sun using the "Get the JDK download" link at the top of the page.
Use Thunderbird's "Extensions" manager (Tools -> Extensions) to "Install" the .xpi file. Select the spam_complaint.xpi file, wait for the 5 second countdown then select "Install." The extension will be installed when you restart Thunderbird. Restart before continuing to the next steps below.
The Add-on will add options to:
Left-click on a SPAM message or select multiple messages using shift + left-Click and ctrl + left-click. After at least one message is selected, right+click and select "Spam Complaint -> Load selected message(s)."
This program prevents the user from loading messages more than once and therefore sending duplicate Spam Complaint messages.
Click on any folder containing only Junk mail. Next, click on the "Tools" drop-down, select the "Spam Complaint" sub-menu, then select on "Load Selected Folder (everything)."
The "Launch GUI" option will start the graphical user interface.
SMTP stands for Simple Mail Transfer Protocol. You will need to add your email account here before sending Spam Complaints. Information for this account is probably in Thunderbird's "Account Settings" under "Outgoing Server (SMTP)." You can select a server from this screen then copy the server name, port, user name, and secure connection type over to your Mail Account in Spam Complaint.

TLS may be implemented in the future. Please email a request.
Occasionally, use the extension manager to find new updates. Updates will not cause the loss of settings or messages.