Flash- and Java contents are blocked by JonDoFox by default, as a web site may otherwise uncover your IP address. However, you may execute a Flash/Java applet by an explicit mouse click. Please note: A lot of websites show Flash applets only if you have previously allowed JavaScript for these sites.

If you just want to view web videos on common video portals, you should download them. if you really want to execute Flash in your browser you should set at least restrictive security settings before:

In order to activate the settings manager, you first have to allow the domains macromedia.com and adobe.com for JavaScript. After that, you should restrict the storage space for web sites to "0" and additionally forbid storage of web site information (third parties) completely. This prevents you from getting so-called Flash cookies.

In order to prevent your IP address from being unconvered easily, you have to forbid your computer any internet connections to the ports 80 and 443. You may do this, for example, by using a personal firewall. If possible, allow exceptions for JonDo or for the JonDonym network addresse, respective.

In order to prevent attacks on your system, you should execute Flash contents only in virtual environments like VMWare or Virtual PC, or in a sandbox.