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How do I change my default file reader from Preview to Adobe in Firefox 3.6.28

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I have always used Preview as my default download reader, however now some documents such as utility bills can only be opened using Adobe 9 reader. My question is this, how do I change my default reader to Adobe 9 in Firefox 3.6.28, Mac OSX 10.4

I have always used Preview as my default download reader, however now some documents such as utility bills can only be opened using Adobe 9 reader. My question is this, how do I change my default reader to Adobe 9 in Firefox 3.6.28, Mac OSX 10.4

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Unrelated to your issue, it looks like you're using a very old version of Firefox. You should upgrade to the latest version, Firefox 11 -- just go to the Help menu and click Check for Updates. This link walks you through the process: Update Firefox to the latest release