What macOS is 107 and 109 compatible with

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I am on v 107 but not anxous to update because not clear what macOS level is cmpatible - I have 10.13 and 10.14 but Firefox loads increasingly slow

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Is anyone going to reply to this question ?

• macOS 10.12 or later

Recommended Hardware

• Mac computer with an Intel x86 or Apple silicon processor
• 512 MB of RAM
• 200 MB hard drive space

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Apparently not !