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Can I get Firefox 3.6.16 for Mac? Where can I find the download?

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My son recently started school through the K12 website. WE could not authenticate user. Tech support said that in order for K12 features to work properly on Firefox I need to be running 3.6.16 (I currently have 3.6.20) and I can only find the 3.6.16 download for a PC (.exe) Is there a version available for Mac and where do I find it?

My son recently started school through the K12 website. WE could not authenticate user. Tech support said that in order for K12 features to work properly on Firefox I need to be running 3.6.16 (I currently have 3.6.20) and I can only find the 3.6.16 download for a PC (.exe) Is there a version available for Mac and where do I find it?

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https://ftp.mozilla.org/pub/mozilla.org/thunderbird/releases/

You can find almost any version for Mac, Windows, or Linux there.