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Downloaded firefox 4.o. Will not work now. I have Mac OS 10.4.11. I am very disappointed in firefox. I need help, I lost a lot of important stuff.

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Firefox up dated and restarted. The firefox screen said that it recommended upgrading to 4.0, so I did. 4.0 replaced the older version and now does not work.

Firefox up dated and restarted. The firefox screen said that it recommended upgrading to 4.0, so I did. 4.0 replaced the older version and now does not work.

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You can get the latest version of Firefox 3.6 from http://www.mozilla.com/en-US/firefox/all-older.html

When you install it, it should use your existing bookmarks and other user data.

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

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Thanks that did the trick. I hope that something will be done to make future versions of firefox amendable to older Mac OS's. Not everyone can afford new computers every couple of years.

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For older Macs that aren't supported in Firefox 4.0, try TenFourFox for PowerPC's running Mac 10.4.11 & 10.5.8 .
http://www.floodgap.com/software/tenfourfox/