burp_jsbeautifier
js-beautifier extension for Burp Suite
Place js-beautifier 1.3.2 Python module
and js-beautifier.py in Burp's Jython module directory.
Tested against Burpsuite Pro v1.5.11 and js-beautifier v1.3.2
Warning: Enabling the automatic modification of all JavaScript may cause significant slowdown where large js files are encountered.