Try Pressing and holding down the keyboard key Ctrl and then pressing 0
the Control key is on the bottom left (& right)
0 is the number Zero

Using Ctrl + 0 should reset the zoom, note it is set for each individual site.

• see how do i use zoom?

To get your toolbar back try pressing the keyboard Alt Key (that is probably next to the spacebar) and may temporarily cause the menu toolbar to display, pressing V then T should give you the options to set the toolbars you wish to display such as the bookmarks toolbar. Note your sone may well have been making use of the firefox button, that also give similar access to features

• see how do i get the firefox button? <-- clickable links (blue)

You may be in full screen viewing mode,that also causes the menu bars to disappear,try pressing keyboard key F11 (wait a few seconds for screen to redraw) that should toggle you in and out of full screen mode.

One thing you may considering in future is setting up on your Vista Operating System separate accounts for your self and your son, that way each can to some extent make changes the way they like without unduly affecting the other.

When setup like that each user has their own firefox profiles and again changes can be made separately.

There could be other reasons for your problems, but I am presuming your son just forgot to return the setting to the ones you had been using.

Thanks that seems to have solved the problem. Now all i have to figure out is what she is doing to cause it to happen since the explanation is always I wasn't doing anything.

Glad it solved the problem, obvously it easy to change the view. As I said considering using separate accounts may help; it does then mean each user is ableto change settings and appearances usually without affecting the other user.