MSFN is made available via donations, subscriptions and advertising revenue. The use of ad-blocking software hurts the site. Please disable ad-blocking software or set an exception for MSFN. Alternatively, register and become a site sponsor/subscriber and ads will be disabled automatically.
I spent 2 long days trying to solve the same problem. I had installed SP3 and upgraded to FF 3 and uninstalled same, reinstalled FF2. I did what you suggested and now hyperlinks work in my Outlook. Thank you so much for sharing your solution.