How to set caret position at the start of designmode iframe in Firefox

I have seen (and use) the answers relating to getting / setting the CURRENT caret position in an iframe with designmode=on. However I need to be able to set the caret position to either the start or the end of the content. IE solution not required, just WC3. Thanks in advance.
emsttamAsked:
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emsttamAuthor Commented:
Had seen the page, but did not notice the comments, thanks.
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