Updated Firefox 43.0.1 blocks access to mozilla.org website due to bad security certificate
There seems to be an issue with your security certificate.
Latest update to firefox on Windows 10 gives an Untrusted Connection message and the following information which appears unusual:
www.mozilla.org uses an invalid security certificate. The certificate is only valid for the following names: gp1.wac.edgecastcdn.net, wac.edgecastcdn.net, ne.wac.edgecastcdn.net, swf.mixpo.com, cdn.traceregister.com, s.tmocache.com, s.my.tmocache.com, e1.boxcdn.net, e2.boxcdn.net, e3.boxcdn.net, static.woopra.com, assets-secure.razoo.com, ec.pond5.com, images.esellerpro.com, use.typekit.com, static.iseatz.com, static.www.turnto.com, inpath-static.iseatz.com, secure.avelleassets.com, static.dubli.com, cdn1.fishpond.co.nz, cdn1.fishpond.com.au, cdn.optimizely.com, cdn.whois.com.au, ne1.wac.edgecastcdn.net, gs1.wac.edgecastcdn.net, edgecast.onegrp.com, cdn.psw.net, cdn.gaggle.net, fast.fonts.com, ec.xnglobalres.com, images.vrbo.com, cdcssl.ibsrv.net, player.vzaar.com, framegrabs.vzaar.com, thumbs.vzaar.com, content.aqcdn.com, content.ebgames.com.au, content.ebgames.co.nz, images.allsaints.com, cdn1-ssl.iha.com, cdn2-b.examiner.com, cdn.trtk.net, ec.dstimage.disposolutions.com, welcome2.carsdirect.com, s1.card-images.com, update.alot.com, www.outsystems.com, www.drwmedia.com, cdn.taxact.com, cdn.taxactonline.com, cdn.200581.com, img.vxcdn.com, js.vxcdn.com, www.cloudwords.com, images.skincarerx.com, ssl.cdn-redfin.com, cdn.foxycart.com, ssl.booztx.com, p.typekit.net, use.typekit.net, cdn.thewatershed.com, b2bportal.disneylandparis.com, b2bportal.disneytravelagents.co.uk, assets.zendesk.com, a.cdnkic.com, s.cdnkic.com, cdn.cartrawler.com, secure.33across.com, static.teamtreehouse.com, www.edgecast.com (Error code: ssl_error_bad_cert_domain)
Chosen solution
There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.
http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html
https://support.mozilla.org/en-US/kb/server-not-found-connection-problem
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
http://kb.mozillazine.org/Error_loading_websites
This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.
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Chosen Solution
There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.
http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html
https://support.mozilla.org/en-US/kb/server-not-found-connection-problem
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
http://kb.mozillazine.org/Error_loading_websites
This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.