Why is firefox suddenly denying access to reliable websites calling them "untrusted"?

My husband has been using a reliable medical site for years...suddenly the message popped up "untrusted site." We contacted the site--they connected us to their tech support--he tried everything with us over the phone (cleaning cookies, downloading latest version of firefox) but the only way to solve it was to give firefox the go-ahead to ignore their warning. We then got the site. Today, the same message popped up on another site he uses regularly. Any ideas why this should suddenly happen on reliable sites used successfully for years?

I would like to block this site. Kindly help me to block this site.

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Why does firefox keep blocking access to social websites like facebook etc????

any time i try to go on any social website i get this msg :
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Access to the web page you were trying to visit has been blocked in accordance with company policy. Please contact your system administrator if you believe this is in error.
User: 10.150.46.8
URL: www.taggedmail.com/new_invites.html?ect=by6lqzxg_fid=663B91D2D7B5A27B_al=sRaB9KH0z_md.1je2Y4.52mvph_tn=bWVzc2FnZXNfbmV3LTEtMy0xLTc=_linkId=new_invites_link_2
Category: social-networking
Click here to login
this msg happens with any social network i go on so why is this happening????????????

thats not true becuz this didnt start happening til i downloaded firefox becuz when i was using internet explorer i didnt have one problem but then i download firefox and i get blocked msgs

Is there a way to create a password for Firefox so Firefox is denied access to the internet without this password?

Is there a way to create a password for Firefox to deny Firefox access to the internet?

There is the Profile Password extension, but it is easily bypassed by using the Firefox SafeMode.
http://nic-nac-project.de/~kaosmos/profilepassword-en.html#PPFF
Another thing you can do is to set your Homepage to a website that you have a password logon saved for and use the Master Password feature. It won't completely stop someone else from using the internet but it will slow them down or make it appear they need a password for access.
https://support.mozilla.com/en-US/kb/Protecting+stored+passwords+using+a+master+password

Why does Firefox hang when accessing SSL content on Oracle 10.3.6 WebLogic with JSSE enabled?

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You might try connecting each computer to the working switch port just to be sure you don't have a problem with the computers. Then try a working computer on the other switch ports to be sure the switch is fully functional. Similarly, check out the modem/router with each computer. This will verify if all the hardware is functional.
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Why is firefox suddenly denying access to reliable websites calling them "untrusted"?

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