Bug 1494733 - make sure mail-headerfield and mail-urlfield are sectable. r=Paenglab

mail/themes/shared/mail/messageHeader.css

@@ -250,19 +250,18 @@ mail-emailaddress[selected="true"] > .emailDisplayButton > .emailStar {
 
 mail-multi-emailHeaderField,
 mail-headerfield,
+mail-urlfield,
 mail-newsgroups-headerfield {
-  margin: 0;
-  padding: 0;
   -moz-box-align: baseline;
 }
 
-mail-headerfield > .headerValue {
+mail-headerfield {
   -moz-user-focus: normal;
   -moz-user-select: text;
   word-wrap: break-word;
 }
 
-mail-headerfield > .headerValue:focus {
+mail-headerfield:focus {
   outline: 1px dotted;
   outline-offset: -1px;
 }