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

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SEC_ERROR_UNKNOWN_ISSUER

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Deleted cookies. Restarted in safe mode. Deleted all history. Reset to firefox original settings. Ran virus detection. Deleted all downloads from last few days. Still no go on working... Ran PowerShell, pinged www.google.com all systems normal. Microsoft edge also not allowing connection. Steam launches no problem. Tried everything (I think) suggested on this site, new idea?

Deleted cookies. Restarted in safe mode. Deleted all history. Reset to firefox original settings. Ran virus detection. Deleted all downloads from last few days. Still no go on working... Ran PowerShell, pinged www.google.com all systems normal. Microsoft edge also not allowing connection. Steam launches no problem. Tried everything (I think) suggested on this site, new idea?

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Is your question about Firefox for Android or Desktop Firefox? In the latter case, please ask in the correct forum. https://support.mozilla.org/questions/new

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Desktop. Thanks.

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