diff --git a/chrome/content/zotero/browser.js b/chrome/content/zotero/browser.js
index d667eb9484..a7ff51faa0 100644
--- a/chrome/content/zotero/browser.js
+++ b/chrome/content/zotero/browser.js
@@ -812,8 +812,10 @@ Zotero_Browser.Tab.prototype._translatorsAvailable = function(translate, transla
 			//and the page is still there
 			&& this.page.document.defaultView && !this.page.document.defaultView.closed
 			//this set of translators is not targeting the same URL as a previous set of translators,
-			// because otherwise we want to use the newer set
-			&& this.page.document.location.href != translate.document.location.href
+			// because otherwise we want to use the newer set,
+			// but only if it's not in a subframe of the previous set
+			&& (this.page.document.location.href != translate.document.location.href ||
+				Zotero.Utilities.Internal.isIframeOf(translate.document.defaultView, this.page.document.defaultView))
 				//the best translator we had was of higher priority than the new set
 			&& (this.page.translators[0].priority < translators[0].priority
 				//or the priority was the same, but...
@@ -823,11 +825,15 @@ Zotero_Browser.Tab.prototype._translatorsAvailable = function(translate, transla
 						|| translate.document.defaultView !== this.page.document.defaultView.top)
 			))
 		) {
+			Zotero.debug("Translate: a better translator was already found for this page");
 			return; //keep what we had
 		} else {
 			this.clear(); //clear URL bar icon
 		}
 		
+		Zotero.debug("Translate: found translators for page\n"
+			+ "Best translator: " + translators[0].label + " with priority " + translators[0].priority);
+		
 		this.page.translate = translate;
 		this.page.translators = translators;
 		this.page.document = translate.document;
@@ -839,6 +845,8 @@ Zotero_Browser.Tab.prototype._translatorsAvailable = function(translate, transla
 		this._attemptLocalFileImport(translate.document);
 	}
 	
+	if(!translators || !translators.length) Zotero.debug("Translate: No translators found");
+	
 	Zotero_Browser.updateStatus();
 }
 
diff --git a/chrome/content/zotero/xpcom/utilities_internal.js b/chrome/content/zotero/xpcom/utilities_internal.js
index af9ed28d2a..0d699639e7 100644
--- a/chrome/content/zotero/xpcom/utilities_internal.js
+++ b/chrome/content/zotero/xpcom/utilities_internal.js
@@ -301,6 +301,19 @@ Zotero.Utilities.Internal = {
 			return null;
 		}
 		return str;
+	},
+	
+	/**
+	 * Determine if one Window is a descendant of another Window
+	 * @param {DOMWindow} suspected child window
+	 * @param {DOMWindow} suspected parent window
+	 * @return {boolean}
+	 */
+	"isIframeOf":function isIframeOf(childWindow, parentWindow) {
+		while(childWindow.parent !== childWindow) {
+			childWindow = childWindow.parent;
+			if(childWindow === parentWindow) return true;
+		}
 	}
 }