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Mac OS 10.5.6 downloaded Firefox 3.6.13 Came as .dmg When I try to launch it says "Not Recognized". Right click for "Open With" refers me to Disk Utility when same results "Not Recognized"

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About my Mac > G5 Desktop OS 10.5.6 Want to upgrade to Firefox 3.6.13 The download comes as a compressed file in .dmg format. When I attempt to launch the .dmg file to decompress I get a error message that says: The following disk images failed to mount: Image > Firefox 3.6.13 Reason > Not Recognized. When I right click to see what opening app it is directed to it says: Open with "DiskImageMounter (default). Disk Utility is offered as another opening resource when I direct the file to Disk Utility and go to Menu Bar select "File" then select "Open Disk Image" (or Cmd + "O") I get the same result. Have tried downloading the file twice more and get the same results

About my Mac > G5 Desktop OS 10.5.6 Want to upgrade to Firefox 3.6.13 The download comes as a compressed file in .dmg format. When I attempt to launch the .dmg file to decompress I get a error message that says: The following disk images failed to mount: Image > Firefox 3.6.13 Reason > Not Recognized. When I right click to see what opening app it is directed to it says: Open with "DiskImageMounter (default). Disk Utility is offered as another opening resource when I direct the file to Disk Utility and go to Menu Bar select "File" then select "Open Disk Image" (or Cmd + "O") I get the same result. Have tried downloading the file twice more and get the same results