''locking a a duplicate of https://support.mozilla.org/en-US/questions/1006095 - please stay with that question thread'' On websites which are supposed to have secure transmission such as login pages I typically get the padlock icon; however, sometimes on these exact same pages I get an exclamation point instead of the padlock icon which says some of the material transmitted is not secure. I checked information from web console under the developer tool, and from my reading of it I get the exclamation point instead of the padlocked icon as a result of my use of the "Do Not Track Me" extension on my browse, and the data from web console says "use of get PreventionDefault () is deprecated. Use defaultPrecated instead," and then there is a reference link to something like resource://dntme/content/lib/firefox.js" Is this something about which I should be concerned?