Why does Firefox's first startup take so long?

Hello
I was hoping if someone could help diagnose and resolve a performance issue I am currently experiencing with my Firefox. On first initial load, it will take 3-4 minutes before the window actually appears.
I've done some research and tried the follwing methods but unfortunately with no success:
# Disabling add-ons - although I don't know how to remove old obsolete ones altogether.
# Creating a new profile
# Amending the shortcut to include "Prefetch:1"
Sebsequent start-ups are ok and I experience no problems - it is just the first initial start-up.
Any guidance and advice would be greatly appreciated.
Many thanks

Not sure what that link is to as I've been waiting 15 minutes now for it to open and still only got a black screen.
My back up gets to just over 3/4 done and then seems to freeze or I am told iTunes has encountered a problem and needs to close.
Sounds like whatever is in that link might be useful, but it's taking as long to open as running a back up so I may give up on that. Is there something that can be added into this thread if there is a magical way of stopping them (sometimes I can click the x in the bar and stop it, sometimes I can't).

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Why does Firefox's first startup take so long?

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