I see top:-500px in the page source:

thanks but as I posted the issues is that my website renders correctly using other browsers. It is only Firefox that does not render the Contacts page correctly.

A good place to ask advice about web development is at the mozillaZine "Web Development/Standards Evangelism" forum.

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I'm not sure if this is caused by the floating sidebar content as a style rule of clear:both or clear:left partially fixes this at least horizontally (it is still off to the left).

thanks you for the link. I'll try that option next. But clearly since:

Internet Explorer 9,8, even 7 Chrome Safari and Opera

render the webpage correctly and there is no issue with validation of both HTML and CSS, then surely Firefox is not working to industry standards. I can use any browser I care to but I can't control what browser my potential clients use.

"I'm not sure if this is caused by the floating sidebar content as a style rule of clear:both or clear:left partially fixes this at least horizontally (it is still off to the left)."

There is nothing wrong with the code is there as it works perfectly with the other browsers listed above? Maybe I should put the whole web page in a table.