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I got a lot of notices about a new version, but it would never download. Now the Firefox icon in the dock has a question mark and won't open

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Firefox will not open. Using Mac 10.6.7. Previously we got notices that we should download the new Firefox version, but it would not open--just spun its wheels.

Firefox will not open. Using Mac 10.6.7. Previously we got notices that we should download the new Firefox version, but it would not open--just spun its wheels.

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Download Firefox 4.0 manually from http://www.firefox.com