diff --git a/tools/webdriver/webdriver/bidi/modules/script.py b/tools/webdriver/webdriver/bidi/modules/script.py
index f128b0d089c28b..737426a5d54641 100644
--- a/tools/webdriver/webdriver/bidi/modules/script.py
+++ b/tools/webdriver/webdriver/bidi/modules/script.py
@@ -96,6 +96,7 @@ def add_preload_script(
         self,
         function_declaration: str,
         arguments: Optional[List[Mapping[str, Any]]] = None,
+        contexts: Optional[List[str]] = None,
         sandbox: Optional[str] = None
     ) -> Mapping[str, Any]:
         params: MutableMapping[str, Any] = {
@@ -104,6 +105,8 @@ def add_preload_script(
 
         if arguments is not None:
             params["arguments"] = arguments
+        if contexts is not None:
+            params["contexts"] = contexts
         if sandbox is not None:
             params["sandbox"] = sandbox
 
diff --git a/webdriver/tests/bidi/script/add_preload_script/contexts.py b/webdriver/tests/bidi/script/add_preload_script/contexts.py
new file mode 100644
index 00000000000000..97d00669d17136
--- /dev/null
+++ b/webdriver/tests/bidi/script/add_preload_script/contexts.py
@@ -0,0 +1,111 @@
+import pytest
+
+from webdriver.bidi.modules.script import ContextTarget
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("domain", ["", "alt"], ids=["same_origin", "cross_origin"])
+async def test_top_context_with_iframes(
+    bidi_session, add_preload_script, new_tab,
+        inline, iframe, domain):
+
+    iframe_content = f"<div>{domain}</div>"
+    url = inline(f"{iframe(iframe_content, domain=domain)}")
+
+    await add_preload_script(
+        function_declaration="() => { window.bar='foo'; }",
+        contexts=[new_tab["context"]])
+
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"],
+        url=url,
+        wait="complete",
+    )
+
+    # Check that preload script applied the changes to the context
+    result = await bidi_session.script.evaluate(
+        expression="window.bar",
+        target=ContextTarget(new_tab["context"]),
+        await_promise=True,
+    )
+    assert result == {"type": "string", "value": "foo"}
+
+    contexts = await bidi_session.browsing_context.get_tree(
+        root=new_tab["context"])
+
+    assert len(contexts[0]["children"]) == 1
+    frame_context = contexts[0]["children"][0]
+
+    # Check that preload script applied the changes to the iframe
+    result = await bidi_session.script.evaluate(
+        expression="window.bar",
+        target=ContextTarget(frame_context["context"]),
+        await_promise=True,
+    )
+    assert result == {"type": "string", "value": "foo"}
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("type_hint", ["tab", "window"])
+async def test_page_script_context_isolation(bidi_session, add_preload_script,
+                                             top_context, type_hint,
+                                             test_page):
+    await add_preload_script(function_declaration="() => { window.baz = 42; }",
+                             contexts=[top_context['context']])
+
+    new_context = await bidi_session.browsing_context.create(
+        type_hint=type_hint)
+
+    # Navigate both contexts to ensure preload script is triggered
+    await bidi_session.browsing_context.navigate(
+        context=top_context['context'],
+        url=test_page,
+        wait="complete",
+    )
+    await bidi_session.browsing_context.navigate(
+        context=new_context["context"],
+        url=test_page,
+        wait="complete",
+    )
+
+    # Check that preload script applied the changes to the context
+    result = await bidi_session.script.evaluate(
+        expression="window.baz",
+        target=ContextTarget(top_context["context"]),
+        await_promise=True,
+    )
+    assert result == {"type": "number", "value": 42}
+
+    # Check that preload script did *not* apply the changes to the other context
+    result = await bidi_session.script.evaluate(
+        expression="window.baz",
+        target=ContextTarget(new_context["context"]),
+        await_promise=True,
+    )
+    assert result == {type: "undefined"}
+
+
+@pytest.mark.asyncio
+async def test_identical_contexts(
+        bidi_session, add_preload_script, new_tab,
+        inline):
+
+    url = inline(f"<div>test</div>")
+
+    await add_preload_script(
+        function_declaration="() => { window.foo = window.foo ? window.foo + 1 : 1; }",
+        contexts=[new_tab["context"], new_tab["context"]])
+
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"],
+        url=url,
+        wait="complete",
+    )
+
+    # Check that preload script applied the changes to the context only once
+    result = await bidi_session.script.evaluate(
+        expression="window.foo",
+        target=ContextTarget(new_tab["context"]),
+        await_promise=True,
+    )
+    assert result == {"type": "number", "value": "1"}
diff --git a/webdriver/tests/bidi/script/add_preload_script/invalid.py b/webdriver/tests/bidi/script/add_preload_script/invalid.py
index 54440ff67804b6..58f1ba02e5fc10 100644
--- a/webdriver/tests/bidi/script/add_preload_script/invalid.py
+++ b/webdriver/tests/bidi/script/add_preload_script/invalid.py
@@ -71,7 +71,8 @@ async def test_params_arguments_channel_ownership_invalid_value(bidi_session):
     with pytest.raises(error.InvalidArgumentException):
         await bidi_session.script.add_preload_script(
             function_declaration="() => {}",
-            arguments=[{"type": "channel", "value": {"ownership": "_UNKNOWN_"}}],
+            arguments=[{"type": "channel", "value": {
+                "ownership": "_UNKNOWN_"}}],
         )
 
 
@@ -186,6 +187,61 @@ async def test_params_arguments_channel_include_shadow_tree_invalid_value(bidi_s
         )
 
 
+@pytest.mark.parametrize("contexts", [False, 42, '_UNKNOWN_', {}])
+async def test_params_contexts_invalid_type(bidi_session, contexts):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.add_preload_script(
+            function_declaration="() => {}",
+            contexts=contexts
+        ),
+
+
+async def test_params_contexts_empty_list(bidi_session):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.add_preload_script(
+            function_declaration="() => {}",
+            contexts=[]
+        ),
+
+
+@pytest.mark.parametrize("value", [None, False, 42, {}, []])
+async def test_params_contexts_context_invalid_type(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.add_preload_script(
+            function_declaration="() => {}",
+            contexts=[value]
+        ),
+
+
+@pytest.mark.parametrize("value", ["", "somestring"])
+async def test_params_contexts_context_invalid_value(bidi_session, value):
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.add_preload_script(
+            function_declaration="() => {}",
+            contexts=[value]
+        ),
+
+
+async def test_params_contexts_context_non_top_level(bidi_session, new_tab, test_page_same_origin_frame):
+    await bidi_session.browsing_context.navigate(
+        context=new_tab["context"],
+        url=test_page_same_origin_frame,
+        wait="complete",
+    )
+
+    contexts = await bidi_session.browsing_context.get_tree(root=new_tab["context"])
+
+    assert len(contexts) == 1
+    assert len(contexts[0]["children"]) == 1
+    child_info = contexts[0]["children"][0]
+
+    with pytest.raises(error.InvalidArgumentException):
+        await bidi_session.script.add_preload_script(
+            function_declaration="() => {}",
+            contexts=[child_info['context']]
+        ),
+
+
 @pytest.mark.parametrize("sandbox", [False, 42, {}, []])
 async def test_params_sandbox_invalid_type(bidi_session, sandbox):
     with pytest.raises(error.InvalidArgumentException):
diff --git a/webdriver/tests/support/fixtures_bidi.py b/webdriver/tests/support/fixtures_bidi.py
index c073997215e7a6..f4c4c19c3bbe7f 100644
--- a/webdriver/tests/support/fixtures_bidi.py
+++ b/webdriver/tests/support/fixtures_bidi.py
@@ -20,10 +20,11 @@
 async def add_preload_script(bidi_session):
     preload_scripts_ids = []
 
-    async def add_preload_script(function_declaration, arguments=None, sandbox=None):
+    async def add_preload_script(function_declaration, arguments=None, contexts=None, sandbox=None):
         script = await bidi_session.script.add_preload_script(
             function_declaration=function_declaration,
             arguments=arguments,
+            contexts=contexts,
             sandbox=sandbox,
         )
         preload_scripts_ids.append(script)