FF display wrong, IE7 is OK

After switching from ‘iNove’ theme to ‘Untheme’ theme, the IE7 display is fine, but FF, which was used while building the site, displays content shifted far to the right instead of being flush with the left margin, and content spills over into right column.

http://www.magicmegamoneymakers.com

HTML validation was perfect, CSS validation as follows:

W3C CSS Validator results for http://www.magicmegamoneymakers.com/ (CSS level 2.1)
Sorry! We found the following errors (5)
URI : http://www.magicmegamoneymakers.com/wp-content/themes/untheme-two-column/style.css
417 .wp-caption Property -moz-border-radius doesn’t exist : 3px
418 .wp-caption Property -khtml-border-radius doesn’t exist : 3px
419 .wp-caption Property -webkit-border-radius doesn’t exist : 3px
420 .wp-caption Property border-radius doesn’t exist in CSS level 2.1 but exists in [css3] : 3px
686 #footer a Value Error : font-size Too many values or values are not recognized : 0.8 em

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Valid CSS information (Is the list of code that follows this indicative of corrections to make? I don’t understand what it means.)

After clearing the cache, the number of errors was reduced from nine to the five shown. Refreshing the page has made no difference at any stage.

I couldn’t find anything to help me in the Codex or on this forum but am new and have little experience using the Codex.

Any help will be appreciated.

Jo/amki