diff --git a/components/script/dom/htmlheadelement.rs b/components/script/dom/htmlheadelement.rs
index cf1cca4decf..ac906229130 100644
--- a/components/script/dom/htmlheadelement.rs
+++ b/components/script/dom/htmlheadelement.rs
@@ -19,6 +19,7 @@ use util::opts;
 use util::resource_files::resources_dir_path;
 use std::borrow::ToOwned;
 use std::fs::read_dir;
+use std::path::PathBuf;
 
 #[dom_struct]
 pub struct HTMLHeadElement {
@@ -51,34 +52,38 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLHeadElement> {
         Some(htmlelement as &VirtualMethods)
     }
     fn bind_to_tree(&self, _tree_in_doc: bool) {
-        if !opts::get().userscripts {
-            return;
-        }
+        if let Some(ref path_str) = opts::get().userscripts {
+            let node: &JSRef<Node> = NodeCast::from_borrowed_ref(self);
+            let first_child = node.GetFirstChild().root();
+            let doc = node.owner_doc().root();
+            let doc = doc.r();
 
-        let node: &JSRef<Node> = NodeCast::from_borrowed_ref(self);
-        let first_child = node.GetFirstChild().root();
-        let doc = node.owner_doc().root();
-        let doc = doc.r();
-
-        let mut path = resources_dir_path();
-        path.push("user-agent-js");
-        let mut files = match read_dir(&path) {
-            Ok(d) => d.filter_map(|e| e.ok()).map(|e| e.path()).collect::<Vec<_>>(),
-            Err(_) => return
-        };
-
-        files.sort();
-
-        for file in files {
-            let name = match file.into_os_string().into_string() {
-                Ok(ref s) if s.ends_with(".js") => "file://".to_owned() + &s[..],
-                _ => continue
+            let path = if &**path_str == "" {
+                let mut p = resources_dir_path();
+                p.push("user-agent-js");
+                p
+            } else {
+                PathBuf::new(path_str)
             };
-            let new_script = doc.CreateElement("script".to_owned()).unwrap().root();
-            let new_script = new_script.r();
-            new_script.set_string_attribute(&atom!("src"), name);
-            let new_script_node: &JSRef<Node> = NodeCast::from_borrowed_ref(&new_script);
-            node.InsertBefore(*new_script_node, first_child.r()).unwrap();
+
+            let mut files = match read_dir(&path) {
+                Ok(d) => d.filter_map(|e| e.ok()).map(|e| e.path()).collect::<Vec<_>>(),
+                Err(_) => return
+            };
+
+            files.sort();
+
+            for file in files {
+                let name = match file.into_os_string().into_string() {
+                    Ok(ref s) if s.ends_with(".js") => "file://".to_owned() + &s[..],
+                    _ => continue
+                };
+                let new_script = doc.CreateElement("script".to_owned()).unwrap().root();
+                let new_script = new_script.r();
+                new_script.set_string_attribute(&atom!("src"), name);
+                let new_script_node: &JSRef<Node> = NodeCast::from_borrowed_ref(&new_script);
+                node.InsertBefore(*new_script_node, first_child.r()).unwrap();
+            }
         }
     }
 }
diff --git a/components/util/opts.rs b/components/util/opts.rs
index 25bd06e61f4..3942ae0ff8e 100644
--- a/components/util/opts.rs
+++ b/components/util/opts.rs
@@ -59,7 +59,11 @@ pub struct Opts {
     pub nonincremental_layout: bool,
 
     pub nossl: bool,
-    pub userscripts: bool,
+
+    /// Where to load userscripts from, if any. An empty string will load from
+    /// the resources/user-agent-js directory, and if the option isn't passed userscripts
+    /// won't be loaded
+    pub userscripts: Option<String>,
 
     pub output_file: Option<String>,
     pub headless: bool,
@@ -181,7 +185,7 @@ pub fn default_opts() -> Opts {
         layout_threads: 1,
         nonincremental_layout: false,
         nossl: false,
-        userscripts: false,
+        userscripts: None,
         output_file: None,
         headless: true,
         hard_fail: true,
@@ -222,7 +226,7 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
         getopts::optopt("y", "layout-threads", "Number of threads to use for layout", "1"),
         getopts::optflag("i", "nonincremental-layout", "Enable to turn off incremental layout."),
         getopts::optflag("", "no-ssl", "Disables ssl certificate verification."),
-        getopts::optflag("", "userscripts", "Uses userscripts in resources/user-agent-js"),
+        getopts::optflagopt("", "userscripts", "Uses userscripts in resources/user-agent-js, or a specified full path",""),
         getopts::optflag("z", "headless", "Headless mode"),
         getopts::optflag("f", "hard-fail", "Exit on task failure instead of displaying about:failure"),
         getopts::optflagopt("", "devtools", "Start remote devtools server on port", "6000"),
@@ -299,7 +303,6 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
 
     let nonincremental_layout = opt_match.opt_present("i");
     let nossl = opt_match.opt_present("no-ssl");
-    let userscripts = opt_match.opt_present("userscripts");
 
     let mut bubble_inline_sizes_separately = debug_options.contains(&"bubble-widths");
     let trace_layout = debug_options.contains(&"trace-layout");
@@ -335,7 +338,7 @@ pub fn from_cmdline_args(args: &[String]) -> bool {
         layout_threads: layout_threads,
         nonincremental_layout: nonincremental_layout,
         nossl: nossl,
-        userscripts: userscripts,
+        userscripts: opt_match.opt_default("userscripts", ""),
         output_file: opt_match.opt_str("o"),
         headless: opt_match.opt_present("z"),
         hard_fail: opt_match.opt_present("f"),