remove user urls from sentry data

addon/webextension/background/senderror.js

@@ -65,6 +65,11 @@ window.errorpopup = (function () {
     });
   };
 
+  function regexpEscape(str) {
+    // http://stackoverflow.com/questions/3115150/how-to-escape-regular-expression-special-characters-using-javascript
+    return str.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
+  }
+
   exports.reportError = function (e) {
     if (!analytics.getTelemetryPrefSync()) {
       console.error("Telemetry disabled. Not sending critical error:", e);
@@ -76,7 +81,17 @@ window.errorpopup = (function () {
       return;
     }
     if (! Raven.isSetup()) {
-      Raven.config(dsn).install();
+      Raven.config(dsn, {
+        dataCallback: function sanitizeSentry(data) {
+          const href = new RegExp(regexpEscape(window.location.href), 'g');
+          const origin = new RegExp(`${regexpEscape(window.location.origin)}[^\s",>]*`, 'g');
+          const json = JSON.stringify(data)
+            .replace(href, 'REDACTED_HREF')
+            .replace(origin, 'REDACTED_URL');
+          const result = JSON.parse(json);
+          return result;
+        }
+      }).install();
     }
     let exception = new Error(e.message);
     exception.stack = e.multilineStack || e.stack || undefined;