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Firefox browser on Mac OS 10.11.6

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I had Firefox but once it was replaced with the new version, it didn't work on my Macbook pro. I need to have Firefox on my old laptop, but its OS (10.11.6) will no longer update, and a new Firefox download won't take. When I go to the download site, it keeps downloading the latest version. How I download an earlier compatible version?

I had Firefox but once it was replaced with the new version, it didn't work on my Macbook pro. I need to have Firefox on my old laptop, but its OS (10.11.6) will no longer update, and a new Firefox download won't take. When I go to the download site, it keeps downloading the latest version. How I download an earlier compatible version?