Windows 10 will reach EOS (end of support) on October 14, 2025. For more information, see this article.

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which is better extended or rapid release support

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Which is better extended or rapid release forum? And, how can I tell if my platform is 64 bit or 64 bit MSI?

Which is better extended or rapid release forum? And, how can I tell if my platform is 64 bit or 64 bit MSI?

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https://support.mozilla.org/en-US/kb/firefox-users-windows-7-8-and-81-moving-extended-support

It appears you are using the eol Windows 8.1 and a older Firefox 115 ESR version at 115.12.0esr

Firefox 115 ESR currently at 115.20.0esr (115.twenty.0esr) is the most current version you can run on Windows 8.1 as Firefox 116.0 and later versions requires Windows 10, 11 to run. Unless Mozilla decides to extend updates again in next while, the last planned update may be 115.21.0esr in March.