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I loaded the 4.0 version of Firefox and now it says I can use it.

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I loaded the 4.0 version of Firefox. Now it says I can't use it. I have a Mac OS X Version 10.4.11.

I loaded the 4.0 version of Firefox. Now it says I can't use it. I have a Mac OS X Version 10.4.11.

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Firefox 4 requires at least OS X 10.5. You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

Mozilla are working to prevent Mac users with non-compatible systems from getting the notification about Firefox 4, and also not displaying the "Download Firefox 4" button on http://www.mozilla.com