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when trying to install 3.6.13 on Mac OS 10.3.9, double-click on disk image gets message "failed to mount - corrupt image" repeatedly.

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Trying to install 3.6.13 on Mac OS 10.3.9. Disk image (3.6.13.dmg) downloads to Mac desktop. When I double-click on the disk image, I get a message "failed to mount - corrupt image." I have downloaded it and gotten same message repeatedly. I currently have Firefox 2.0.0.20.

Trying to install 3.6.13 on Mac OS 10.3.9. Disk image (3.6.13.dmg) downloads to Mac desktop. When I double-click on the disk image, I get a message "failed to mount - corrupt image." I have downloaded it and gotten same message repeatedly. I currently have Firefox 2.0.0.20.

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Firefox 2.0.0.20 is the last release that runs on Mac OS X 10.2 and 10.3
Firefox 3.0 versions and later require at least Mac OS X 10.4

See:

Mac: https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/