Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

Please provide a public link (no password) that we can check out. No Personal Information Please !

Make sure you are not blocking content.

https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop also see https://blog.mozilla.org/security/2021/03/23/introducing-smartblock/

https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection

Diagnose Firefox issues using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

Many site issues can be caused by corrupt cookies or cache.

Warning ! ! This will log you out of sites you're logged in to. You may also lose any settings for that website.

• Delete cookies to remove the information websites have stored on your computer {web link}

• How to clear the Firefox cache {web link}

Bonjour et merci FredMcD !

Le problème est simple, dès que je veux ouvrier tweeter ou un lien tweeter le message d'erreur suivant apparait 'Une erreur s'est produite. Essayez de recharger la page.'

Je tiens à repéciser que tout fonctionne correctement si j'utilise une fenêtre firefox privée !

Traduction - Translation Hello and thank you FredMcD! The problem is simple, as soon as I want to tweet or tweet a link the following error message appears' An error has occurred. Try to reload the page. '

I would like to reiterate that everything works correctly if I use a private firefox window!

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-firefox-did-not-connect

https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors

What do the security warning codes mean

Thanks a lot Fred ! It seems a simple cache clearing fixed the problem !!

Ok theres still a problem, i cant login in standard firefox window....

Ok the problem was coming from one add on "ad block plus" !!! Thanks again Fred for your great help you save my life ^^ All the best for you !!!!

Glad to help. Safe Surfing.