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I have a problem with Safari on different macOS versions. Is there any information from which version Safari doesn't support 32 bit architecture? Like Firefox (from v.56) and Chrome (from v.74) on macOS.

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    What is the actual problem?
    – mmmmmm
    Aug 17 '20 at 17:08
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    Yes, tell us what the problem is, because it probably isn't whether Safari is 32-bit or not. Also, the question doesn't really make sense: the OS supports or doesn't support 32-bit architecture; Safari is or isn't compiled as 32-bit or 64-bit binary code. Safari doesn't 'support' architectures.
    – benwiggy
    Aug 17 '20 at 17:18
  • I'm going to guess the asker has a 32bit NPAPI plugin they need to run. Aug 18 '20 at 3:47
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According to Wikipedia - https://en.wikipedia.org/wiki/Safari_(web_browser)#64-bit_builds - Safari has been 64-bit since Snow Leopard OS X 10.6 in 2009, which would be Safari 5, [around the same time they stopped supporting Windows.]

All Macs since then have been 64-bit capable, but until Catalina have been backwards compatible with 32-bit applications.
The last OS X to be capable of running on 32-bit architecture was also Snow Leopard, 10.6

The App Store will only offer you builds of Safari compatible with your Mac's hardware & OS
Safari 11 - 10.11 to 10.12
Safari 12 - 10.12 to 10.13
Safari 13 - 10.13 to 10.15
Safari 14 - macOS 11 [backwards compatibility currently unknown]

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