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I am having trouble upgrading Firefox on my MacBook Pro

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Currently running version 3.6.18. I successfully download the new version, but cannot complete the steps to install. The install steps I have are for new installs, not upgrade installs. Any advice would be appreciated.

Currently running version 3.6.18. I successfully download the new version, but cannot complete the steps to install. The install steps I have are for new installs, not upgrade installs. Any advice would be appreciated.

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