does your ISP block the sites? or maybe the person/;people in charge of the router/internet service?

I honnestly don't know. All I know, when I try to go on a certain site, it tells me "Échec de la connexion sécurisée" meaning "Failure of the secured connection" or something like that...

contact your ISP (internet service provider) , maybe their security is out of date ,

Might be the case. But what's odd about it... When I use an old version of Firefox, Facebook can work again.

try a different browser? like chrome or edge , maybe firefox just being dumb

Well, I did try Chrome but it doesn't seem to work with me.
As for Edge, I have no idea.

But yeah, I may need to replace Firefox pretty soon if I can't solve the problem.

I'd love to help but I have no clue about how such things happen and can be fixed, I fear. ^^'

Well... All I know, when I try to go on a certain site, it tells me "Échec de la connexion sécurisée" meaning "Failure of the secured connection" or something like that...

Seems like we are on the same level of experience in that regard. I haven't had that kind of notification before. Google says something about websites that start with https need to have some sort of certificate to be downloaded to be accessed but I don't know what that actually means or how you get those. Maybe somebody needs to reverse your PC settings to a time before that error happened.

Now that you mention, yeah, there was that sort of certificate. They're also talking something about personal datas. Passwords, private infos... That kind of stuff.

I only read about stuff called SSL though I don't know in which way that stuff might be part of Firefox or Windows or anything. Usually one would expect that you can get internet and reach such globally popular websites like Facebook. ^^'

Yeah. And when I use an older version of Firefox, Facebook can work again. So, I guess the current Firefox version has a bug to that.

Definitely sounds like an issue with the browser itself. Firefox did recently receive a new update a couple days ago (62.0.3) so you may have to use the previous version temporarily until the issue is fixed. The strange thing though is that I'm on the current version myself and I'm not having any problems with it. You could try doing a browser refresh (https://support.mozilla.org/fr/kb/r.....les-parametres) and see if that fixes your problems. Just keep in mind that it will reset your settings and any add-on extensions you've installed. Things like your saved login info won't be reset though. It WILL reset the security certificates used for Secure Sockets Layer (SSL) connections, so it's definitely worth a try. If that doesn't work, try looking through some of the troubleshooting steps here: https://support.mozilla.org/fr/kb/q.....xion-securisee

Problem solved! Thanks a lot! *Glomps and hugs you.*