this fixes #59

src/js/matrix.js

@@ -84,7 +84,8 @@ var nameToStateMap = {
 var switchBitOffsets = {
         'matrix-off': 0,
       'https-strict': 2,
-        'ua-spoof': 4
+          'ua-spoof': 4,
+    'referrer-spoof': 6
 };
 
 var switchStateToNameMap = {

src/js/messaging-handlers.js

@@ -462,6 +462,7 @@ var onMessage = function(request, sender, callback) {
                 matrixSwitches: {
                     'https-strict': µm.pMatrix.evaluateSwitch('https-strict', '*') === 1,
                     'ua-spoof': µm.pMatrix.evaluateSwitch('ua-spoof', '*') === 1,
+                    'referrer-spoof': µm.pMatrix.evaluateSwitch('referrer-spoof', '*') === 1
                 }
             };
             break;

src/js/storage.js

@@ -404,19 +404,26 @@
     var matrixReady = false;
 
     // TODO: to remove when everybody (and their backup file) has their
-    // ua-spoof setting converted into a matrix switch.
+    // ua-spoof/referrer-spoof setting converted into a matrix switch.
     var onSettingsAndMatrixReady = function() {
         if ( !settingsReady || !matrixReady ) {
             return;
         }
-        if ( µm.userSettings.hasOwnProperty('spoofUserAgent') === false ) {
-            return;
-        }
+        var saveMatrix = false;
         if ( µm.userSettings.spoofUserAgent ) {
             µm.tMatrix.setSwitch('ua-spoof', '*', 1);
             µm.pMatrix.setSwitch('ua-spoof', '*', 1);
+            saveMatrix = true;
+        }
+        if ( µm.userSettings.processReferer ) {
+            µm.tMatrix.setSwitch('referrer-spoof', '*', 1);
+            µm.pMatrix.setSwitch('referrer-spoof', '*', 1);
+            saveMatrix = true;
+        }
+        if ( saveMatrix ) {
             µm.saveMatrix();
         }
+        delete µm.userSettings.processReferer;
         delete µm.userSettings.spoofUserAgent;
         µm.saveUserSettings();
     };

src/js/traffic.js

@@ -467,13 +467,10 @@ var onBeforeSendHeadersHandler = function(details) {
         changed = foilCookieHeaders(µm, details) || changed;
     }
 
-    // TODO: use cookie cell to determine whether the referrer info must be
-    // foiled.
-    if ( µm.userSettings.processReferer && µm.mustBlock(pageStore.pageHostname, reqHostname, '*') ) {
+    if ( µm.tMatrix.evaluateSwitchZ('referrer-spoof', pageStore.pageHostname) ) {
         changed = foilRefererHeaders(µm, reqHostname, details) || changed;
     }
 
-    // TODO: move the master ua-spoofing switch into the matrix.
     if ( µm.tMatrix.evaluateSwitchZ('ua-spoof', pageStore.pageHostname) ) {
         changed = foilUserAgent(µm, details) || changed;
         // https://github.com/gorhill/httpswitchboard/issues/252
@@ -559,29 +556,29 @@ var foilCookieHeaders = function(µm, details) {
 
 var foilRefererHeaders = function(µm, toHostname, details) {
     var headers = details.requestHeaders;
-    var header;
-    var fromDomain, toDomain;
-    var i = headers.length;
+    var i = headers.length, header;
     while ( i-- ) {
         header = headers[i];
-        if ( header.name.toLowerCase() !== 'referer' ) {
-            continue;
+        if ( header.name.toLowerCase() === 'referer' ) {
+            break;
+        }
     }
-        fromDomain = µm.URI.domainFromURI(header.value);
-        if ( !toDomain ) {
-            toDomain = µm.URI.domainFromHostname(toHostname);
+    if ( i === -1 ) {
+        return false;
     }
+    var µmuri = µm.URI;
+    var fromDomain = µmuri.domainFromURI(header.value);
+    var toDomain = µmuri.domainFromHostname(toHostname);
     if ( toDomain === fromDomain ) {
-            continue;
+        return false;
     }
-        // console.debug('foilRefererHeaders()> foiled referer "%s" for "%s"', fromDomain, toDomain);
+    //console.debug('foilRefererHeaders()> foiled referer for "%s"', details.url);
+    //console.debug('\treferrer "%s"', header.value);
     // https://github.com/gorhill/httpswitchboard/issues/222#issuecomment-44828402
-        // Splicing instead of blanking: not sure how much it helps
-        headers.splice(i, 1);
+    header.value = µmuri.schemeFromURI(details.url) + '://' + toHostname + '/';
+    //console.debug('\treplaced with "%s"', header.value);
     µm.refererHeaderFoiledCounter++;
     return true;
-    }
-    return false;
 };
 
 /******************************************************************************/

src/popup.html

@@ -35,6 +35,7 @@
                 <ul id="mtxSwitches">
                     <li id="mtxSwitch_https-strict" class="dropdown-menu-entry"><span data-i18n="matrixSwitchNoMixedContent"></span>
                     <li id="mtxSwitch_ua-spoof" class="dropdown-menu-entry"><span data-i18n="matrixSwitchUASpoof"></span>
+                    <li id="mtxSwitch_referrer-spoof" class="dropdown-menu-entry"><span data-i18n="matrixSwitchReferrerSpoof"></span>
                 </ul>
             </div>
             <div class="dropdown-menu-capture"></div>

src/privacy.html

@@ -80,7 +80,7 @@ html.rtl #spoof-user-agent-with {
         <button class="whatisthis"></button>
         <div class="whatisthis-expandable para" data-i18n="privacyClearCacheHelp"></div>
     <li>
-        <input id="process-referer" type="checkbox" data-setting-bool="processReferer"><label data-i18n="privacyProcessRefererPrompt" for="process-referer"></label>
+        <input id="process-referer" type="checkbox" data-matrix-switch="referrer-spoof"><label data-i18n="privacyProcessRefererPrompt" for="process-referer"></label>
         <button class="whatisthis"></button>
         <div class="whatisthis-expandable para" data-i18n="privacyProcessRefererHelp"></div>
     <li>

tools/_locales/en/messages.json

@@ -115,6 +115,10 @@
         "message": "User agent spoofing",
         "description": ""
     },
+    "matrixSwitchReferrerSpoof" : {
+        "message": "Referrer spoofing",
+        "description": ""
+    },
 
 
     "statsPageTitle" : {
@@ -342,7 +346,7 @@
         "description": ""
     },
     "privacyProcessRefererPrompt" : {
-        "message": "Remove third-party <a href='https://en.wikipedia.org/wiki/HTTP_referer'>HTTP referer</a> information from requests to non-whitelisted hostnames.",
+        "message": "Spoof <a href='https://en.wikipedia.org/wiki/HTTP_referer'>HTTP referrer</a> string of third-party requests.",
         "description": ""
     },
     "privacyProcessRefererHelp" : {