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My laptop died. I've dusted off my old iMac running OSX 10.2.8 and want to upgrade firefox to 3.5 or 3.6. Looks like I can't do that - where would I find older versions of firefox to update to?

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My now dead laptop was running Firefox 3.6. It died. Now I have my old iMac out of storage. It has Firefox 2.0.0.1 on it. I'm using it now. Check for updates says I can go as high as 2.0.0.20. I'd like to upgrade the iMac to the most current operating system it can work with (right now it's at OSX 10.2.8), and then get Firefox up to the most current version this can run. I tried searching for older firefox versions to download, but can't seem to find them on your website. (I used search term "download Firefox 3.5"). I did this to check and see what OSX version they can work with. Let me know what I need to do. Thanks!

My now dead laptop was running Firefox 3.6. It died. Now I have my old iMac out of storage. It has Firefox 2.0.0.1 on it. I'm using it now. Check for updates says I can go as high as 2.0.0.20. I'd like to upgrade the iMac to the most current operating system it can work with (right now it's at OSX 10.2.8), and then get Firefox up to the most current version this can run. I tried searching for older firefox versions to download, but can't seem to find them on your website. (I used search term "download Firefox 3.5"). I did this to check and see what OSX version they can work with. Let me know what I need to do. Thanks!

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Firefox 2.0.0.20 is the last ever release for Mac OSX 10.3.9 and earlier versions.
Get it here:
https://ftp.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.20/mac/en-US/

System requirements for Firefox 3.5:
Mac OS X 10.4 and later, Macintosh computer with an Intel x86 or PowerPC G3, G4, or G5 processor, 128 MB RAM (Recommended: 256 MB RAM or greater), 200 MB hard drive space
http://www.mozilla.com/en-US/firefox/3.5/system-requirements/