hi, what security software are you running on your device?

I'm using windows defender, but im notusing any internet filters. I'll attach a screenshot to help figure it out :)

Oh my god It's not blocked anymore. UPDATE: Okay, I take it back. it doesent

thank you! we'd probably you'd to inspect the failing certificates closer because under normal circumstances this shouldn't happen of course:

1. please enter chrome://pippki/content/exceptionDialog.xul into the address-bar
2. on the interface that opens enter "https://www.google.co.uk" (or whichever particular url is failing to load) into the location server field.
3. click on get certificate & view and see who is mentioned in the issued by-section. please report back with this info here in the forum.

It says "Microsoft Family Safety"

ok, so this might be happening in windows 10 accounts restricted by microsoft family parental controls. microsoft is intercepting secure/encrypted network connections in order to record and monitor used search terms. if you don't want to use this feature intentionally, you could turn that off for your account like described at: http://windows.microsoft.com/en-us/windows-10/turn-off-microsoft-family-settings

if you'd really like to use this feature in order for that to work in firefox you'd need to some configuration work in firefox, and install the certificate of ms family safety that is getting used to intercept secure connections into the browser's trust store. while in the affected account, open this link in firefox - then a dialog about adding a cert should display. please check the box to Trust this CA to identify web sites & confirm the change.

alternatively you could also try the manual steps described at https://support.microsoft.com/en-us/kb/2965142 in the section about firefox.