Trying to install this tool:
http://ftp.mozilla.org/pub/mozilla.org/firefox/releases/44.0/linux-x86_64/en-US/firefox-44.0.tar.bz2
Seems like .tar.bz2 is not supported and gives an exception in the build log (complete stacktrace see Attachment):

Caused by: java.io.IOException: incorrect header check
at com.jcraft.jzlib.InflaterInputStream.read(InflaterInputStream.java:112)
at org.apache.commons.compress.utils.IOUtils.readFully(IOUtils.java:160)

Quick workaround ist to wget and unpack manually.
Custom Tools Plugin version: 0.4.4
Jenkins Version: 1.646 running on JDK8