File Extension XPI
File extension XPI is used by
Normally XPI file is a ZIP archive that contains a number of other files in compressed format. Usually one of these files is install.js that contains main install script. These may also be other files that are referenced by this script.
Since installer packages can change system configuration and install additional executable modules they can be used to spread computer viruses and trojans. We recommend that you only install packages from trusted sources and have up-to-data antivirus software running at all time.