This from my colleague, self-described Security Curmudgeon, Matt DuHarte.


As we were discussing here are some of the Firefox addons that are in my standard load out.

Tamper data -

Hackbar -

Live HTTP headers -

Refspoof -

User Agent Switcher -

WebDeveloper Toolbar -


More heavyweight

Firebug -

Greasemonkey -

SQL Inject-ME -



Please share if you have some other security related tools you would like to recommend.