diff -uNr jsactions_2.2.0/chrome/content/cscript.js jsactions-modified/chrome/content/cscript.js
--- jsactions_2.2.0/chrome/content/cscript.js	2006-03-01 18:41:04.343750000 +0900
+++ jsactions-modified/chrome/content/cscript.js	2006-03-10 21:17:43.000000000 +0900
@@ -20,7 +20,8 @@
                     onLink: false,
                     link: false,
                     onImage: false,
-                    isTextSelected: (this._getFocusedWindow().getSelection().toString().length != 0)
+		    // _contextMenuObject.isTextSelected は呼び出さない。
+                    // isTextSelected: (this._getFocusedWindow().getSelection().toString().length != 0)
                 }
             }
         },
@@ -31,11 +32,29 @@
             else
                 return focusedWindow;
         },
+	get selection() {
+	    var targetWindow = this._getFocusedWindow();
+	    var sel = Components.lookupMethod(targetWindow, 'getSelection').call(targetWindow);
+	    // for textfields
+	    if (sel && !sel.toString()) {
+		var node = document.commandDispatcher.focusedElement;
+		if (node &&
+		    (node.type == "text" || node.type == "textarea") &&
+		    'selectionStart' in node &&
+		    node.selectionStart != node.selectionEnd) {
+		    var offsetStart = Math.min(node.selectionStart, node.selectionEnd);
+		    var offsetEnd   = Math.max(node.selectionStart, node.selectionEnd);
+		    return node.value.substr(offsetStart, offsetEnd-offsetStart);
+		}
+	    }
+    
+	    return sel ? sel.toString() : "";
+	},
         get target(){ return this._contextMenuObject.target; },
         get onLink(){ return this._contextMenuObject.onLink; },
         get link(){ return this._contextMenuObject.link; },
         get onImage(){ return this._contextMenuObject.onImage; },
-        get isTextSelected(){ return this._contextMenuObject.isTextSelected; }
+        get isTextSelected(){ return this.selection.length != 0; }
     },
 
         //Add by HideAway - Toggle AllowJavaScriptThisTab