Issue 4655 - Removing an installed search engine replaces it with a new search option

toolkit/components/search/nsSearchService.js

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 const Ci = Components.interfaces;
 const Cc = Components.classes;
 const Cr = Components.results;
 const Cu = Components.utils;
 
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
@@ skipping 3923 matching lines @@
     LOG("getEngines: getting all engines");
     var engines = this._getSortedEngines(true);
     aCount.value = engines.length;
     return engines;
   },
 
   getVisibleEngines: function SRCH_SVC_getVisible(aCount) {
     this._ensureInitialized();
     LOG("getVisibleEngines: getting all visible engines");
     var engines = this._getSortedEngines(false);
-    // Capped visible engine count at 5 according to https://issues.adblockplus.org/ticket/3128
-    engines = engines.slice(0, Math.min(engines.length, 5));
     aCount.value = engines.length;
     return engines;
   },
 
   getDefaultEngines: function SRCH_SVC_getDefault(aCount) {
     this._ensureInitialized();
     function isDefault(engine) {
       return engine._isDefault;
     }
     var engines = this._sortedEngines.filter(isDefault);
@@ skipping 833 matching lines @@
 
     if (engine._iconUpdateURL) {
       // If we're updating the engine too, use the new engine object,
       // otherwise use the existing engine object.
       (testEngine || engine)._setIcon(engine._iconUpdateURL, true);
     }
   }
 };
 
 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([SearchService]);