diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8551edfe..98e0bdf0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,9 +3,11 @@
 ---
 ## 3.5.3 Determine browser versions on Windows
 ### Bugfixes
-- Fixed logger for EdgeChromiumDriverManager and IEDriverManager (Resolves [#269](https://github.com/SergeyPirogov/webdriver_manager/issues/269), [#272](https://github.com/SergeyPirogov/webdriver_manager/issues/272)).
+- Fixed logger for EdgeChromiumDriverManager and IEDriverManager ([#269](https://github.com/SergeyPirogov/webdriver_manager/issues/269), [#272](https://github.com/SergeyPirogov/webdriver_manager/issues/272)).
+- Fixed `JSONDecodeError` when raising `ValueError` message of failed request. ([#273](https://github.com/SergeyPirogov/webdriver_manager/issues/273)).
+- Fixed `geckodriver` permissions. When `webdriver.Firefox(GeckoDriverManager().install())` caused `os error 10061`.
 ### Features
-- Determine browsers versions on Windows 32/64 bit by many ways. MSEdge, Chrome, Chromium, Firefox. PowerShell required. (Resolves [#261](https://github.com/SergeyPirogov/webdriver_manager/issues/261), [#193](https://github.com/SergeyPirogov/webdriver_manager/issues/193), [#293](https://github.com/SergeyPirogov/webdriver_manager/issues/293)).
+- Determine browsers versions on Windows 32/64 bit by many ways. MSEdge, Chrome, Chromium, Firefox. PowerShell required. ([#261](https://github.com/SergeyPirogov/webdriver_manager/issues/261), [#193](https://github.com/SergeyPirogov/webdriver_manager/issues/193), [#293](https://github.com/SergeyPirogov/webdriver_manager/issues/293)).
 ---
 - ## 3.5.2
 ### Features
diff --git a/tests/test_edge_driver.py b/tests/test_edge_driver.py
index 2dad09e8..0b1178e2 100644
--- a/tests/test_edge_driver.py
+++ b/tests/test_edge_driver.py
@@ -28,11 +28,10 @@ def test_driver_with_ssl_verify_disabled_can_be_downloaded(ssl_verify_enable):
 
 def test_edge_manager_with_wrong_version():
     with pytest.raises(ValueError) as ex:
-        driver_path = EdgeChromiumDriverManager(
+        EdgeChromiumDriverManager(
             version="0.2",
             os_type='win64',
         ).install()
-        webdriver.Edge(executable_path=driver_path)
 
     assert (
                "There is no such driver by url "
diff --git a/tests/test_firefox_manager.py b/tests/test_firefox_manager.py
index 0ee69ca3..5b72e2a3 100644
--- a/tests/test_firefox_manager.py
+++ b/tests/test_firefox_manager.py
@@ -26,8 +26,7 @@ def test_driver_with_ssl_verify_disabled_can_be_downloaded(ssl_verify_enable):
 
 def test_gecko_manager_with_wrong_version():
     with pytest.raises(ValueError) as ex:
-        driver_path = GeckoDriverManager("0.2").install()
-        webdriver.Firefox(executable_path=driver_path)
+        GeckoDriverManager("0.2").install()
 
     assert "There is no such driver by url "\
         "https://api.github.com/repos/mozilla/geckodriver/releases/tags/0.2" \
diff --git a/tests/test_opera_manager.py b/tests/test_opera_manager.py
index c2c1dbb8..43604cce 100755
--- a/tests/test_opera_manager.py
+++ b/tests/test_opera_manager.py
@@ -49,8 +49,7 @@ def test_operadriver_manager_with_selenium():
 
 def test_opera_driver_manager_with_wrong_version():
     with pytest.raises(ValueError) as ex:
-        driver_path = OperaDriverManager("0.2").install()
-        webdriver.Opera(executable_path=driver_path)
+        OperaDriverManager("0.2").install()
 
     assert "There is no such driver by url " \
            "https://api.github.com/repos/operasoftware/operachromiumdriver/" \
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 7a890fa8..7a06ce97 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,27 +1,41 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
-from webdriver_manager import utils
-from unittest import mock
 import pytest
-import json
+from requests import Response, Request
+
+from webdriver_manager import utils
 
 
-def test_validate_response_json_decode_error():
-    resp = mock.Mock()
+def test_validate_response_value_error_not_200_and_not_404():
+    resp = Response()
     resp.headers = {}
-    resp.request.url = "http://example.com"
-    resp.content = "content"
-    resp.json = mock.Mock(side_effect=json.decoder.JSONDecodeError("", "", 0))
+    resp.request = Request()
+    resp.request.url = "https://example.com"
+    resp.status_code = 301
+    resp._content = b"abc"
+
     with pytest.raises(ValueError) as excinfo:
         utils.validate_response(resp)
+
     assert str(excinfo.value) == "\n".join(
         [
             "response body:",
-            "content",
+            "abc",
             "request url:",
-            "http://example.com",
+            "https://example.com",
             "response headers:",
             "{}",
             ""
         ]
     )
+
+
+def test_validate_response_value_error_404():
+    resp = Response()
+    resp.request = Request()
+    resp.url = "https://example.com"
+    resp.status_code = 404
+
+    with pytest.raises(ValueError) as excinfo:
+        utils.validate_response(resp)
+
+    expected_message = "There is no such driver by url https://example.com"
+    assert str(excinfo.value) == expected_message
diff --git a/webdriver_manager/firefox.py b/webdriver_manager/firefox.py
index c0cf80eb..d4167dd3 100644
--- a/webdriver_manager/firefox.py
+++ b/webdriver_manager/firefox.py
@@ -1,4 +1,5 @@
 import logging
+import os
 
 from webdriver_manager import utils
 from webdriver_manager.driver import GeckoDriver
@@ -26,4 +27,7 @@ def __init__(self, version="latest",
                                   mozila_release_tag=mozila_release_tag)
 
     def install(self):
-        return self._get_driver_path(self.driver)
+        driver_path = self._get_driver_path(self.driver)
+
+        os.chmod(driver_path, 0o755)
+        return driver_path