User:PerfektesChaos/xpi-install

Installation

 * The  file is to be put somewhere on the local file system. On the   configuration page for add-ons of the browser there is a tool button. This gives access to “install from file”. Select the downloaded .xpi file, restart browser.
 * The xpi file is a regular ZIP file. Any source code might be extracted and inspected, even modified and logging debug messages.