Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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Mij stipescams. Wy sille jo nea freegje in telefoannûmer te beljen, der in sms nei ta te stjoeren of persoanlike gegevens te dielen. Meld fertochte aktiviteit mei de opsje ‘Misbrûk melde’.

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Firefox not working - Secure Connection Failed

ericbates

Secure Connection Failed An error occurred during a connection to (Firefox and ALL sites) PR_CONNECT_RESET_ERROR Error code: PR_CONNECT_RESET_ERROR Help advises 'Failed to check for updates' Problem arose on upgrade to Firefox 138 Tried restart, computer reboot and reinstallation

I am not sufficiently computer literate to understand supposed help and support documents within 'Mozilla Support'

It looks like the end of 20 years of using Firefox ... Google Chrome used to submit this request

Secure Connection Failed An error occurred during a connection to (Firefox and ALL sites) PR_CONNECT_RESET_ERROR Error code: PR_CONNECT_RESET_ERROR Help advises 'Failed to check for updates' Problem arose on upgrade to Firefox 138 Tried restart, computer reboot and reinstallation I am not sufficiently computer literate to understand supposed help and support documents within 'Mozilla Support' It looks like the end of 20 years of using Firefox ... Google Chrome used to submit this request
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Keazen oplossing

Alle antwurden (4)

What OS? If windows, home or pro? If windows, are you running any security software besides MS Defender?

Jon Thanks Running Windows 10 Home Not using Windows Defender but run Kaspersky IS I confirm Firefox is not working even if KIS temporarily disabled

Keazen oplossing

Jon Thanks for your advice. The first solution (answer-1557674) worked :)