Why are there F's when there should be S's in The Declaration of Independence?

Watch this video to find out...

Are they F's after all?

SONG!: "Bill of Rights Song"

Chorus
It’s the Bill of Rights, it’s the bill of your rights
It’s time to take your knowledge up to unfamiliar heights
The thrill of your life, just like riding a bike
You’re never, never, never going to forget the Bill of Rights
(×2)

Verse I
The right to free speech and religion and press
Are guaranteed by Amendment One
Amendment Number Two says it’s true, that it’s all up to you
If you choose to possess a gun

The government can’t force you to house and feed a soldier
Says Amendment Number Three
Amendment Number Four we adore says without a warrant
Your stuff can’t be searched or seized

Chorus

Verse II
Amendment Number Five says the court can’t try you
With evidence they already used
It also says that nobody can make you self-incriminate
You’re allowed to stay silent if you choose.

Amendment Number Six won’t let the criminal clock tick
The rights of the accused continue here, and then
Amendment Number Seven gives you one plus eleven:
A right to a trial by a jury of your peers

If it’s cruel and unusual punishment
It’s ruled out by Amendment Eight
Amendment Number Nine says that other rights are fine
And Ten gives the rest to the states.

Library of Virginia: Founding Documents: The Virginia Statute for Religious Freedom (VIDEO)

SONG!: "Bill of Rights Rap"