From MozillaZine Knowledge Base
In order to allow external applications to track what's happening inside the browser, Mozilla implements an MSAA (Microsoft Active Accessibility) server. This lets outside programs—such as screen readers, voice recognition software, and other accessibility-enhancing applications—track focus changes, listen for events, and read window contents.
This preference exists largely for debugging purposes.
Possible values and their effects
MSAA calls to
First checked in
Has an effect in