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I got a warning telling me Firefox no longer supports my operating system after updating to Firefox 16. I have Mac OS X 10.5.8 on a Macbook.

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I have a Macbook, OS X 10.5.

After I updated my browser to Firefox 16, I got a warning, "Firefox no longer supports your operating system version and will be vulnerable to online attacks" which leads me to this page: http://support.mozilla.org/en-US/kb/firefox-no-longer-works-mac-os-x-10-5#os=mac&browser=fx16

On this page, it says BOTH Firefox 16 works and doesn't work with OS X 10.5, leaving me very confused. http://support.mozilla.org/en-US/kb/install-firefox-mac#os=mac&browser=fx16

I would like to have a secure version of Firefox without having to switch browsers or buy a new computer. Should I restore Firefox 15? Or is there something I should look out for?

I have a Macbook, OS X 10.5. After I updated my browser to Firefox 16, I got a warning, "Firefox no longer supports your operating system version and will be vulnerable to online attacks" which leads me to this page: http://support.mozilla.org/en-US/kb/firefox-no-longer-works-mac-os-x-10-5#os=mac&browser=fx16 On this page, it says BOTH Firefox 16 works and doesn't work with OS X 10.5, leaving me very confused. http://support.mozilla.org/en-US/kb/install-firefox-mac#os=mac&browser=fx16 I would like to have a secure version of Firefox without having to switch browsers or buy a new computer. Should I restore Firefox 15? Or is there something I should look out for?

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Firefox 16 versions still work with your OS X 10.5 operating system, but that is the last version that will work.
Firefox 17 will require OS X 10.6 and later.

You can see the Firefox 17 (currently in beta) system requirements here:

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So there is no security compromise for using Firefox 16?

By the time Firefox 17 comes out I'll hopefully have a new computer. Just wanted to make sure that while I'm still using my macbook I still have the full browsing experience.

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Firefox 16 fully works on your computer and there is no problem with the security in using Firefox 16. You can use that version without compromising anything.