Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Mozilla Support में खोजें

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was closed and archived. Please ask a new question if you need help.

SEC_ERROR_UNKNOWN_ISSUER

more options

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?

All Replies (3)

more options

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

more options