We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

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 archived. Please ask a new question if you need help.

Firefox isn’t working properly for about 3 weeks..

  • 1 reply
  • 1 has this problem
  • 8 views
  • Last reply by FredMcD

IchigoGL200
IchigoGL200
more options

Hello,

I’m having trouble accessing sites like outlook mail box. I get error 500 something has gone wrong. I can login fine if I’m using edge or chrome. I noticed other sites I’m not able to login without getting some errors.

I uninstalled Firefox, deleted its files in appdata and in registry. Is there another fix to this? Or is the only solution to move to another browser?

Hello, I’m having trouble accessing sites like outlook mail box. I get error 500 something has gone wrong. I can login fine if I’m using edge or chrome. I noticed other sites I’m not able to login without getting some errors. I uninstalled Firefox, deleted its files in appdata and in registry. Is there another fix to this? Or is the only solution to move to another browser?

All Replies (1)

FredMcD
FredMcD
more options

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

Websites don't load - troubleshoot and fix error messages

http://kb.mozillazine.org/Error_loading_websites

What do the security warning codes mean