
Revert to 32-bit firefox
how to download older versions of firefox?
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With Mac OS X 10.12 you can use the current release and it isn't recommended to install older version and specially 32-bit Firefox on Mac using a version that supports a universal binary.
I don't know when they started offering only 64-bit and stopped with the universal builds. What reasons do you have for going back to 32-bit Firefox ?
Firefox 53.0 (released way back on April 19, 2017) dropped support for 32-bit macOS as it was 64-bit only from that point.
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