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Like in IE9, I can switch to IE8 compatibility mode. I want to be able to switch to FF3.6 when i am running FF4. Is this possible?

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I want to be able to switch to FF3.6 mode like in IE9 we can switch to IE8 mode.

Is this possible in FF?

I want to be able to switch to FF3.6 mode like in IE9 we can switch to IE8 mode. Is this possible in FF?

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Sorry, no it isn't possible. Firefox 4.0 replaced Firefox 3.6 when you installed 4.0, plus Firefox doesn't need a "compatibility mode" like IE has - Firefox has always been more compatible with W3C standards than earlier versions of IE were and doesn't need that "mode" like IE does to display web pages made for older versions of IE without breaking those web pages.

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Sorry, no it isn't possible. Firefox 4.0 replaced Firefox 3.6 when you installed 4.0, plus Firefox doesn't need a "compatibility mode" like IE has - Firefox has always been more compatible with W3C standards than earlier versions of IE were and doesn't need that "mode" like IE does to display web pages made for older versions of IE without breaking those web pages.

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Unfortunately that's just not true. Here is an example of a site that's not viewing correctly in 4.0. That compatibility mode is still needed. http://www.thethoughtfulchristian.com/TabCenter/Group_Studies.aspx

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This page looks fine to me in Firefox 4.0.
http://www.thethoughtfulchristian.com/TabCenter/Group_Studies.aspx

Try clearing your browser cache.

Tools > Clear Recent History... - hit Details and make sure only Cache is selected, then select Everything and hit the Clear Now button.