this is about firefox 37.0.1 on ubuntu 14.04. i bring up the list of certificates, select some of them and then click delete or distrust. they disappear from the list. the next time i bring up that list, they are there again. but when i then select one of them and then click edit trust, all 3 checkboxes are selected, telling me that firefox trusts those certificates even though i specifically told it NOT to trust them. why? what is going on here? also, there is a verisign certificate that is required for yahoo searches. i can't get firefox to trust this one. i select it and click on edit trust, and none of the checkboxes are checked. i click the one for the websites, then OK. problem is, when i click OK, nothing happens. the only way to get rid of that window is to click cancel or the red X in the corner of the window. and then, the next time i start firefox, the certificate is untrusted again, and i have to do it all again. it's annoying. so to summarize, firefox insists on trusting untrustworthy certificates, and refuses to trust the ones that i want to trust. instead of punching out new versions like cinema tickets, you guys need to do more testing and make sure everything works.