diff --git a/grattoir/__init__.py b/grattoir/__init__.py
index e019c4c..258e3eb 100644
--- a/grattoir/__init__.py
+++ b/grattoir/__init__.py
@@ -1,60 +1,97 @@
-from selenium.webdriver import firefox
 from fake_useragent import UserAgent
 from pathlib import Path
+from selenium.webdriver import firefox
 import importlib
 import os
+import tempfile
 import types
+import uuid
 
 
-def tor_profile():
-    tor_firefox_path = str(Path("~/.tor project/firefox").expanduser())
-    ini_path = tor_firefox_path + "/profiles.ini"
-    with open(ini_path) as ini:
-        for line in ini:
-            if "Path=" in line:
-                return tor_firefox_path + '/' + line.split('=')[1][:-1]
-
-
-def tor_browser_binary_path():
-    for pe in os.environ["PATH"].split(os.pathsep):
-        checkname = os.path.join(pe, "tor-browser")
-        if os.access(checkname, os.X_OK) and not os.path.isdir(checkname):
-            return checkname
-    return None
-
-
-def install_har_export_trigger(driver):
-    with importlib.resources.path(
-        __package__ + ".assets",
-        "har_export_trigger-0.6.2resigned1.xpi",
-    ) as p:
-        driver.install_addon(p.as_uri()[7:])
-    return driver
-
-
-def har_data(self):
-    return self.execute_async_script(
-    "HAR.triggerExport().then(arguments[0]);"
-)
-
+def unique_name(prefix):
+    return prefix + str(uuid.uuid4())
 
 
 class Grattoir(object):
-    def __enter__(self):
+    def __init__(self, name, with_har=False):
+        self.name = name
+        self.with_har = with_har
+
+    def init_const(self, name, with_har):
+        self.name = name
+        if self.with_har:
+            self.har_filename = unique_name(self.name)
+            self.har_export_path = tempfile.TemporaryDirectory()
+            self.export_path = (
+                str(self.har_export_path) + "/" + self.har_filename
+            )
+
+    def tor_browser_binary_path(self):
+        for pe in os.environ["PATH"].split(os.pathsep):
+            checkname = os.path.join(pe, "tor-browser")
+            if os.access(checkname, os.X_OK) and not os.path.isdir(checkname):
+                return checkname
+        return None
+
+    def install_har_export_trigger(self):
+        with importlib.resources.path(
+            __package__ + ".assets",
+            "har_export_trigger-0.6.2resigned1.xpi",
+        ) as p:
+            self._driver.install_addon(p.as_uri()[7:])
+
+    def tor_profile_path(self):
+        tor_firefox_path = str(Path("~/.tor project/firefox").expanduser())
+        ini_path = tor_firefox_path + "/profiles.ini"
+        with open(ini_path) as ini:
+            for line in ini:
+                if "Path=" in line:
+                    return tor_firefox_path + '/' + line.split('=')[1][:-1]
+
+    def har_enabled_profile(self, profile):
+        prefs = {
+            "extensions.netmonitor.har.enableAutomation": True,
+            "extensions.netmonitor.har.contentAPIToken": "test",
+            "extensions.netmonitor.har.autoConnect": True,
+            "devtools.netmonitor.har.compress": False,
+            "devtools.netmonitor.har.defaultFileName": self.har_filename,
+            "devtools.netmonitor.har.defaultLogDir": str(self.har_export_path),
+            "devtools.netmonitor.har.enableAutoExportToFile": True,
+            "devtools.netmonitor.har.forceExport": True,
+            "devtools.netmonitor.har.includeResponseBodies": True,
+            "devtools.netmonitor.har.jsonp": True,
+            "devtools.netmonitor.har.jsonpCallback": True,
+            "devtools.netmonitor.har.pageLoadedTimeout": "2500",
+            "devtools.toolbox.selectedTool": "netmonitor",
+            "devtools.netmonitor.persistlog": True,
+        }
+        for k, v in prefs.items():
+            profile.set_preference(k, v)
+        return profile
+
+    def firefox_profile(self):
+        profile = firefox.firefox_profile.FirefoxProfile(profile_directory=self.tor_profile_path())
+        if self.with_har:
+            profile = har_enabled_profile(profile)
+        return profile
+
+    def init_driver(self):
         self._driver = None
-        p_path = tor_profile()
-        profile = firefox.firefox_profile.FirefoxProfile(profile_directory=p_path)
-        profile.set_preference("devtools.toolbox.selectedTool", "netmonitor")
-        profile.set_preference("devtools.netmonitor.persistlog", True)
-        b_path = tor_browser_binary_path()
+        b_path = self.tor_browser_binary_path()
         binary = firefox.firefox_binary.FirefoxBinary(firefox_path=b_path)
-        o = firefox.options.Options()
-        o.profile = profile
-        o.binary = binary
-        self._driver = firefox.webdriver.WebDriver(options=o)
-        self._driver = install_har_export_trigger(self._driver)
-        self._driver.har_data = types.MethodType(har_data, self._driver)
+        profile = self.firefox_profile()
+        options = firefox.options.Options()
+        options.profile = profile
+        options.binary = binary
+        self._driver = firefox.webdriver.WebDriver(options=options)
+        self.install_har_export_trigger()
+
+    def __enter__(self):
+        self.init_const(self.name, self.with_har)
+        self.init_driver()
         return self._driver
 
     def __exit__(self, exc_type, exc_value, exc_tb):
         self._driver.quit()
+        if self.with_har:
+            self.har_export_path.cleanup()