The vertical scroll bar in Firefox is a menace. Internet Explorer just grays it out when there is no need for scrolling. Firefox removes it, making the design “jump” from side to side when swiching pages. I have customers calling me, claiming there is an error with the design because it jumps from side to side.
Is there a solution for this? Yes. There are 2, a good and a better one.
You can add the Mozilla specific -moz-scrollbars-vertical to the HTML tag in your css:
html {
overflow: -moz-scrollbars-vertical;
}
Unfortunately this eliminates the horizontal scroll bar so users can’t scroll horizontally if need be.
Another solution is to use the overflow-y on the HTML tag in the css:
html {
overflow-y: scroll;
}
This solution has the disadvantage that the CSS will not validate, as the overflow-y does not exist i CSS 2 but only in CSS3.
There is a 3rd solution which is to modify your local C:\Program Files\Mozilla Firefox\res\html.css file with one of the 2 solutions above. This only works on your machine though.
Brian Pedersen's Sitecore and .NET Blog 
I think this works also and without any side effects, at least on my website :-)
html {
height: 100%;
}
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I think you can also achieve the same thing by adding the following to sitecore\shell\Themes\Standard\Firefox\Content Manager.css
HTML {
background:#666666;
overflow: scroll;
}
This enables scrolling where applicable within firefox for the content editor.
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Thanks for that tip. The second option works very well in my version of Firefox.
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