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MAC OSX 10.4.11 Have firefox 3.6.13 now, tried to update to 4.0 without success. What should I try?

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The download goes OK but the message box where you move the Firefox symbol to the Application logo does not come up automatically. I go to my desktop and click on the icon for Firefox 4.0 .dmg At this point one of two things occur, either there is a circle and slash across the Firefox log and I cannot do anything, or the circle and slash is not there and I can move the Firefox logo to the application logo. It begins to run, I select "replace" existing Firefox and it runs a bit longer. Then it say 1 of 2 files. no enough KB

The download goes OK but the message box where you move the Firefox symbol to the Application logo does not come up automatically. I go to my desktop and click on the icon for Firefox 4.0 .dmg At this point one of two things occur, either there is a circle and slash across the Firefox log and I cannot do anything, or the circle and slash is not there and I can move the Firefox logo to the application logo. It begins to run, I select "replace" existing Firefox and it runs a bit longer. Then it say 1 of 2 files. no enough KB

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Firefox 4 requires at least OS X 10.5 and an Intel Mac. There is a third party version of Firefox 4 that runs on OS X 10.4/10.5 and PPC Macs, for details see http://www.floodgap.com/software/tenfourfox

The latest version of Firefox 3.6 is currently 3.6.16 available 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