diff --git a/browser/base/content/browser.js b/browser/base/content/browser.js
index 53760486a87..358aa26cc45 100644
--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -2957,7 +2957,7 @@ const BrowserSearch = {
     var etitle = target.title;
     var ehref = target.href;
     const searchRelRegex = /(^|\s)search($|\s)/i;
-    const searchHrefRegex = /^https?:\/\//i;
+    const searchHrefRegex = /^(https?|ftp):\/\//i;
 
     if (!etype)
       return;
diff --git a/browser/components/search/nsSearchService.js b/browser/components/search/nsSearchService.js
index 1d352fafe7e..16428208d68 100755
--- a/browser/components/search/nsSearchService.js
+++ b/browser/components/search/nsSearchService.js
@@ -99,7 +99,7 @@ const OPENSEARCH_NS_11  = "http://a9.com/-/spec/opensearch/1.1/";
 
 // Although the specification at http://opensearch.a9.com/spec/1.1/description/
 // gives the namespace names defined above, many existing OpenSearch engines
-// are using the former versions.  We therefore allow either.
+// are using the following versions.  We therefore allow either.
 const OPENSEARCH_NAMESPACES = [ OPENSEARCH_NS_11, OPENSEARCH_NS_10,
                                 "http://a9.com/-/spec/opensearchdescription/1.1/",
                                 "http://a9.com/-/spec/opensearchdescription/1.0/"];
@@ -845,6 +845,7 @@ function Engine(aLocation, aSourceDataType, aIsReadOnly) {
     switch (aLocation.scheme) {
       case "https":
       case "http":
+      case "ftp":
       case "data":
       case "file":
       case "resource":
@@ -1046,10 +1047,10 @@ Engine.prototype = {
    * Sets the .iconURI property of the engine.
    *
    *  @param aIconURL
-   *         A URI string pointing to the engine's icon. Must have a http[s] or
-   *         data scheme. Icons with HTTP[S] schemes will be downloaded and
-   *         converted to data URIs for storage in the engine XML files, if
-   *         the engine is not readonly.
+   *         A URI string pointing to the engine's icon. Must have a http[s],
+   *         ftp, or data scheme. Icons with HTTP[S] or FTP schemes will be
+   *         downloaded and converted to data URIs for storage in the engine
+   *         XML files, if the engine is not readonly.
    *  @param aIsPreferred
    *         Whether or not this icon is to be preferred. Preferred icons can
    *         override non-preferred icons.
@@ -1068,7 +1069,7 @@ Engine.prototype = {
 
     LOG("_setIcon: Setting icon url \"" + uri.spec + "\" for engine \""
         + this.name + "\".");
-    // Only accept remote icons from http[s]
+    // Only accept remote icons from http[s] or ftp
     switch (uri.scheme) {
       case "data":
         this._iconURI = uri;
@@ -1077,6 +1078,7 @@ Engine.prototype = {
         break;
       case "http":
       case "https":
+      case "ftp":
         // No use downloading the icon if the engine file is read-only
         // XXX could store the data: URI in a pref... ew?
         if (!this._readOnly) {
diff --git a/browser/components/sidebar/src/nsSidebar.js b/browser/components/sidebar/src/nsSidebar.js
index 33b9df9daa0..6a889356f14 100644
--- a/browser/components/sidebar/src/nsSidebar.js
+++ b/browser/components/sidebar/src/nsSidebar.js
@@ -191,16 +191,16 @@ function (engineURL, expectedSuffix, iconURL)
 {
   try
   {
-    // make sure using HTTP or HTTPS and refering to the expected kind of file
+    // make sure using HTTP, HTTPS, or FTP and refering to the expected kind of file
     // for the engine.
-    const engineRegexp = new RegExp("^https?:\/\/.+\." + expectedSuffix + "$", "i");
+    const engineRegexp = new RegExp("^(https?|ftp):\/\/.+\." + expectedSuffix + "$", "i");
     if (! engineRegexp.test(engineURL))
       throw "Unsupported search engine URL";
   
-    // make sure using HTTP or HTTPS and refering to a
+    // make sure using HTTP, HTTPS, or FTP and refering to a
     // .gif/.jpg/.jpeg/.png/.ico file for the icon.
     if (iconURL &&
-        ! /^https?:\/\/.+\.(gif|jpg|jpeg|png|ico)$/i.test(iconURL))
+        ! /^(https?|ftp):\/\/.+\.(gif|jpg|jpeg|png|ico)$/i.test(iconURL))
       throw "Unsupported search icon URL.";
   }
   catch(ex)