Firefox keeps popin this shit for some sites that isn't

Fix your certificates.
Set your PC date correct.

install gentoo.

>I add exception but that doesn't do anything

The perfect reason why all user overwrites should be removed.

>>52267189
Either your time and date settings are wrong, or someone is watching your traffic. Or, which is unlikely, their HTTPS is unsafe. And it's *your* problem, not Firefox's.

>>52267247
>2016
>defending Mozzarella Firecucks
>for free

>>52267189
Check your date/time.

>>52267263
I'm not some Mozilla fanatic. Sure, OP can install Chrome or some other botnet, but the problem will stay.

>>52267247
>>52267278
Both date and time are on point
What do you mean someone is watching my traffic and how that would cause this problem?

>>52267421
Someone could be intercepting the website you're trying to visit and put their own certificate in there but since it's not signed by a certificate authority it's untrusted.

But maybe if you clicked the "Technical Details" section we could actually help you.

I found what what was the problem
fucking avast web protection bullshit

>>52267518
this

thank you

Well OP's problem was solved but this is pretty relevant to this thread so I'm going to post it anyway.

https://groups.google.com/forum/#!topic/mozilla.dev.platform/ZNKxYgIk_Sg

SHA1 is being disabled for new certificates due to the weakness in the algorithm. If you have a site that uses SHA1 already it will be allowed to continue but if the cert is issued after a certain date firefox will throw up a warning similar to the one in OP's post.