diff --git a/blc/__main__.py b/blc/__main__.py
index f7a92f8..98bd415 100644
--- a/blc/__main__.py
+++ b/blc/__main__.py
@@ -40,6 +40,7 @@ def main(args):
         "password": None,
         "smtp_server": None,
         "recipient": None,
+        "browser_sleep": None,
     }
 
     if not config_args.debug:
@@ -81,6 +82,9 @@ def main(args):
                         help='It represent the email where send the report')
     parser.add_argument('-n', '--deep-scan', action='store_true',
                         help='Enable the deep scan')
+    parser.add_argument('-b', '--browser_sleep', type=float,
+                        help='Enable browser extension '
+                        '(if params used) and set his sleep time')
     args = parser.parse_args()
 
     # We verify the dependency
@@ -103,6 +107,7 @@ def main(args):
             target,
             delay=args.delay if args.delay is not None else 1.0,
             deep_scan=args.deep_scan,
+            browser_sleep=args.browser_sleep,
         )
         if conn:
             checker.conn = conn
diff --git a/blc/checker.py b/blc/checker.py
index a4184fb..3987d36 100644
--- a/blc/checker.py
+++ b/blc/checker.py
@@ -25,7 +25,8 @@ class Checker:
         just verify the availability of these URL
     """
 
-    def __init__(self, host: str, delay: int = 1, deep_scan: bool = False):
+    def __init__(self, host: str, delay: int = 1, deep_scan: bool = False,
+                 browser_sleep: float = None):
         """Init the checker."""
         # We config the logger
         self.logging = logging.getLogger(f'checker({host})')
@@ -37,6 +38,9 @@ def __init__(self, host: str, delay: int = 1, deep_scan: bool = False):
         self.conn.headers.update({
             "User-Agent": "BrokenLinkChecker/1.0",
         })
+        self.timeout = 2
+        self.browser_sleep = browser_sleep
+        self.max_download_size = 1048576  # 1MB
 
         self.host = host
 
@@ -120,9 +124,10 @@ def check(self, url: str) -> requests_html.HTMLResponse:
         # We make a connection
         try:
             if self.is_same_host(url):
-                response = self.conn.get(url, timeout=2, stream=True)
+                response = self.conn.get(url, timeout=self.timeout,
+                                         stream=True)
             else:
-                response = self.conn.head(url, timeout=2)
+                response = self.conn.head(url, timeout=self.timeout)
         except requests.exceptions.ReadTimeout:
             self.urls[url]['result'] = False, None, "Timeout!"
         except requests.exceptions.ConnectionError:
@@ -156,18 +161,25 @@ def update_list(self, response: requests_html.HTMLResponse) -> None:
         # We verify if the content is a webpage
         if self.REGEX_CONTENT_TYPE.match(response.headers['Content-Type']):
             self.logging.debug('Getting of the webpage...')
+
             # We execute the js script
-            try:
-                # We wait 10s to load the js and in case of connection latency
-                response.html.render(timeout=10, sleep=10)
-            except (AttributeError, requests_html.etree.ParserError):
-                # we read max 2**20 bytes by precaution
+            if self.browser_sleep is not None:
+                data = None
+                try:
+                    # We wait to load the js and in case of connection latency
+                    response.html.render(
+                        timeout=self.timeout,
+                        sleep=self.browser_sleep)
+                    data = response.html.html
+                except (AttributeError, requests_html.etree.ParserError):
+                    pass
+
+            if data is None:
+                # we read fixed bytes by precaution
                 response.raw.decode_content = True
-                data = response.raw.read(1048576)
+                data = response.raw.read(self.max_download_size)
                 self.logging.debug('Decoding of data...')
                 data = data.decode()
-            else:
-                data = response.html.html
 
             # We verify if we are not already got this content
             #   in the previous request