diff --git a/README.md b/README.md
index 374884ad3..3bc6240ae 100644
--- a/README.md
+++ b/README.md
@@ -1135,7 +1135,7 @@ Ability to choose different datacenters for run in cloud service. Default value
 Ability to run headless browser in cloud service. Default value is `null`.
 
 ####  isolation
-Ability to execute tests in isolated clean-state environment ([incognito browser context](https://chromedevtools.github.io/devtools-protocol/tot/Target/#method-createBrowserContext)). It means that `testsPerSession` can be set to `Infinity` in order to speed up tests execution and save browser resources. Currently works only in chrome@93 and higher. Default value is `false`, but `true` for chrome@93 and higher.
+Ability to execute tests in isolated clean-state environment ([incognito browser context](https://chromedevtools.github.io/devtools-protocol/tot/Target/#method-createBrowserContext)). It means that `testsPerSession` can be set to `Infinity` in order to speed up tests execution and save browser resources. Currently works only in chrome@93 and higher. Default value is `null`, but `true` for chrome@93 and higher.
 
 ### system
 
diff --git a/src/config/browser-options.js b/src/config/browser-options.js
index 244c0f670..ceec97242 100644
--- a/src/config/browser-options.js
+++ b/src/config/browser-options.js
@@ -319,15 +319,15 @@ function buildBrowserOptions(defaultFactory, extra) {
             defaultValue: defaultFactory("isolation"),
             parseCli: value => utils.parseBoolean(value, "isolation"),
             parseEnv: value => utils.parseBoolean(value, "isolation"),
-            validate: is("boolean", "isolation"),
+            validate: value => _.isNull(value) || is("boolean", "isolation")(value),
             map: (value, config, currentNode, meta) => {
-                if (meta.isSpecified) {
+                if (meta.isSetByUser || !_.isNull(value)) {
                     return value;
                 }
 
                 const caps = _.get(currentNode, "desiredCapabilities");
 
-                return caps && isSupportIsolation(caps.browserName, caps.browserVersion) ? true : value;
+                return caps ? isSupportIsolation(caps.browserName, caps.browserVersion) : value;
             },
         }),
     });
diff --git a/src/config/defaults.js b/src/config/defaults.js
index 400a1d216..325719277 100644
--- a/src/config/defaults.js
+++ b/src/config/defaults.js
@@ -91,7 +91,7 @@ module.exports = {
     key: null,
     region: null,
     headless: null,
-    isolation: false,
+    isolation: null,
 };
 
 module.exports.configPaths = [".hermione.conf.ts", ".hermione.conf.js"];
diff --git a/test/src/config/browser-options.js b/test/src/config/browser-options.js
index 5443da888..92f3ed65d 100644
--- a/test/src/config/browser-options.js
+++ b/test/src/config/browser-options.js
@@ -1200,6 +1200,46 @@ describe("config browser-options", () => {
 
             assert.isFalse(config.browsers.b1.isolation);
         });
+
+        describe("should set to 'false' by user even if browser support isolation", () => {
+            it("in top level config", () => {
+                const readConfig = {
+                    isolation: false,
+                    browsers: {
+                        b1: mkBrowser_({
+                            desiredCapabilities: {
+                                browserName: "chrome",
+                                browserVersion: "101.0",
+                            },
+                        }),
+                    },
+                };
+                Config.read.returns(readConfig);
+
+                const config = createConfig();
+
+                assert.isFalse(config.browsers.b1.isolation);
+            });
+
+            it("in browser config", () => {
+                const readConfig = {
+                    browsers: {
+                        b1: mkBrowser_({
+                            isolation: false,
+                            desiredCapabilities: {
+                                browserName: "chrome",
+                                browserVersion: "101.0",
+                            },
+                        }),
+                    },
+                };
+                Config.read.returns(readConfig);
+
+                const config = createConfig();
+
+                assert.isFalse(config.browsers.b1.isolation);
+            });
+        });
     });
 
     describe("saveHistoryMode", () => {