View source for Firefox/3.6/DLL Blocking

In order to prevent incompatible DLL files from causing potentially exploitable but assuredly undesirable instability, Firefox 3.6 will use two strategies to prevent unauthorized DLLs from loading:
# A whitelist of authorized components in the "components folder" (%appdir%\components) will be compiled at build time, and Firefox will not load any other DLL/js placed in the components folder. 
# A blacklist of forbidden DLLs will be compiled at build time, and any DLL on that list will not be loaded by the Firefox process.

This page tracks the progress of these projects, outstanding issues, and ownership.