displayed.so

hii i am getting a red crossed mark on the lock sign in the browser tab (where the ip address is written).i know that google searches are secure..and a green light ought to be displayed.so does that mean that my computer security has been jeopardised??can anyone shed light on this plz?? thanx

Every time I click on a *.html in Ubuntu it asks me to whetehr open it in termainal ,display,run it.I dont think this has any use coz *.html files can only be displayed.So sombody plz tell me how to stop this & just do open of the file rather than asking me useless questions???