Bug #282985 --> add options UI for turning off the phishing detector.

mail/base/content/phishingDetector.js

@@ -53,7 +53,7 @@ const kPhishingWithMismatchedHosts = 2;
 function isMsgEmailScam(aUrl)
 {
   var isEmailScam = false; 
-  if (!aUrl)
+  if (!aUrl || !gPrefBranch.getBoolPref("mail.phishing.detection.enabled"))
     return isEmailScam;
  
   // Ignore nntp and RSS messages

mail/components/prefwindow/content/pref-advanced.xul

@@ -59,6 +59,7 @@
 
     var _elementIDs = [ // privacy settings
                        "javascriptAllowMailNews", "networkImageDisableImagesInMailNews", "useWhiteList", "whiteListAbURI",
+                       "enablePhishingDetector",
                        
                        // return receipts
                        "alwaysRequest", "receiptFolder", "receiptSend", "notInToCcPref", "outsideDomainPref", "otherCasesPref",
@@ -109,8 +110,11 @@
               </menupopup>
             </menulist>  
           </hbox>
-
         
+        <checkbox id="enablePhishingDetector"
+                 label="&enablePhishingDetector.label;" accesskey="&enablePhishingDetector.accesskey;"
+                 prefstring="mail.phishing.detection.enabled"/>
+                                           
         <checkbox id="javascriptAllowMailNews"
                   label="&enbJsCheckMailNews.label;" accesskey="&enbJsCheckMailNews.accesskey;"
                   prefstring="javascript.allow.mailnews"/>

mail/locales/en-US/chrome/messenger/pref-advanced.dtd

@@ -6,6 +6,8 @@
 <!ENTITY disableImageInMailNews.accesskey "B">
 <!ENTITY allowRemoteImagesForFriends.label  "Allow remote images if the sender is in my:">
 <!ENTITY allowRemoteImagesForFriends.accesskey "A">
+<!ENTITY enablePhishingDetector.label      "Check mail messages for email scams">
+<!ENTITY enablePhishingDetector.accesskey  "l">
 <!ENTITY enbJsCheckMailNews.label      "Enable JavaScript in mail messages.">
 <!ENTITY enbJsCheckMailNews.accesskey  "J">