Firefox/Mozilla Demo: Installing and executing programs via link icons
This problem affects Mozilla, Firefox and probably other Mozilla derivatives on all operating systems. The following demo has only been designed for Firefox; while it might not work with other browsers of the Mozilla family, these browsers may also be vulnerable.
The browser check demo creates the harmless batch file C:\browsercheck.bat under Windows and launches this file. Under Linux, the file ~/browsercheck.sh is created in the user's home directory and then executed. On Mac OS X systems, the demo launches the text editor. While the demo has been designed for Firefox, it should basically also work on Mozilla.
If clicking on "execute text" opens a new window with a command line and a file listing, the demo worked properly; otherwise, it failed. In some cases two such windows may be displayed due to timing problems. Under Linux, another window with "0" is opened. You can simply close these windows and delete the browser check files on your system.