diff --git a/content/handlers/javascript/duktape/dukky.c b/content/handlers/javascript/duktape/dukky.c
index dcbff6854..560a12f56 100644
--- a/content/handlers/javascript/duktape/dukky.c
+++ b/content/handlers/javascript/duktape/dukky.c
@@ -608,7 +608,7 @@ void js_finalise(void)
 
 /* exported interface documented in js.h */
 nserror
-js_newcontext(int timeout, jscallback *cb, void *cbctx, jscontext **jsctx)
+js_newcontext(int timeout, jscontext **jsctx)
 {
 	duk_context *ctx;
 	jscontext *ret = calloc(1, sizeof(*ret));
diff --git a/content/handlers/javascript/js.h b/content/handlers/javascript/js.h
index d5af7211a..522dd9879 100644
--- a/content/handlers/javascript/js.h
+++ b/content/handlers/javascript/js.h
@@ -28,8 +28,6 @@
 typedef struct jscontext jscontext;
 typedef struct jsobject jsobject;
 
-typedef bool(jscallback)(void *ctx);
-
 struct dom_event;
 struct dom_document;
 struct dom_node;
@@ -52,12 +50,10 @@ void js_finalise(void);
  * There is usually one context per browsing context (browser window)
  *
  * \param timeout elapsed wallclock time (in seconds) before \a callback is called
- * \param cb the callback when the runtime exceeds the timeout
- * \param cbctx The context to pass to the callback
  * \param jsctx Updated to the created JS context
  * \return NSERROR_OK on success, appropriate error otherwise.
  */
-nserror js_newcontext(int timeout, jscallback *cb, void *cbctx, jscontext **jsctx);
+nserror js_newcontext(int timeout, jscontext **jsctx);
 
 /**
  * Destroy a previously created context
diff --git a/content/handlers/javascript/none/none.c b/content/handlers/javascript/none/none.c
index 80a9ce49c..26b9b5300 100644
--- a/content/handlers/javascript/none/none.c
+++ b/content/handlers/javascript/none/none.c
@@ -35,8 +35,7 @@ void js_finalise(void)
 {
 }
 
-nserror js_newcontext(int timeout, jscallback *cb, void *cbctx,
-		jscontext **jsctx)
+nserror js_newcontext(int timeout, jscontext **jsctx)
 {
 	*jsctx = NULL;
 	return NSERROR_OK;
diff --git a/desktop/browser_window.c b/desktop/browser_window.c
index 3c072ef0f..3d1a19f60 100644
--- a/desktop/browser_window.c
+++ b/desktop/browser_window.c
@@ -329,22 +329,6 @@ browser_window__get_contextual_content(struct browser_window *bw,
 }
 
 
-/**
- * slow script handler
- */
-static bool slow_script(void *ctx)
-{
-	static int count = 0;
-	NSLOG(netsurf, INFO, "Continuing execution %d", count);
-	count++;
-	if (count > 1) {
-		count = 0;
-		return false;
-	}
-	return true;
-}
-
-
 /**
  * implements the download operation of a window navigate
  */
@@ -3101,8 +3085,7 @@ browser_window_initialise_common(enum browser_window_create_flags flags,
 	assert(bw);
 
 	/* new javascript context for each window/(i)frame */
-	err = js_newcontext(nsoption_int(script_timeout),
-			    slow_script, NULL, &bw->jsctx);
+	err = js_newcontext(nsoption_int(script_timeout), &bw->jsctx);
 	if (err != NSERROR_OK)
 		return err;