It’s a bug in Firefox that when you hide and then show SWF (Flex or Flash) again, it will be reloaded.
So, this is workaround.
Firstly, do not use “display: none” CSS to hide the div that contains Flash. Use “visibility: hidden ” instead.
What about layout? Yes, it may be a problem due to “visibility: hidden” just [...]
ที่มา: http://www.devx.com/tips/Tip/13638
It’s fairly easy to confuse the Cascading Style Sheets (CSS) properties display and visibility, because it would seem that they do much the same thing. However, the two properties are in fact quite different. The visibility property determines whether a given element is visible or not (visibility=”visible|hidden”). However, when visibility is set to hidden, [...]
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