These are also reasons we have heard in the past from a variety of sources:
*It is interesting to note that Firefox market share in corporate environments appears to be pretty closely tracking with the increased use of Firefox in the general internet population. Firefox use inside many organization often starts with IT, web development teams, and engineering departments and then spreads to other departments and individual users.
*<b>Concerns about security</b> is a strategic reason some organizations move to Firefox exclusively, or set up support support for multiple browsers.