diff --git a/desktop_env/evaluators/metrics/__init__.py b/desktop_env/evaluators/metrics/__init__.py
index 1494872..200b56f 100644
--- a/desktop_env/evaluators/metrics/__init__.py
+++ b/desktop_env/evaluators/metrics/__init__.py
@@ -11,7 +11,7 @@ from .table import compare_table
 from .vlc import is_vlc_playing, is_vlc_recordings_folder, is_vlc_fullscreen, compare_images, compare_audios, \
     compare_videos
 from .gimp import increase_saturation, decrease_brightness, check_file_exists, compare_triangle_positions
-from .general import check_csv, check_accessibility_tree, check_list, run_sqlite3
+from .general import check_csv, check_accessibility_tree, check_list, run_sqlite3, check_json
 from .thunderbird import check_thunderbird_prefs, check_thunderbird_filter
 from .vscode import compare_text_file, compare_config, compare_answer, is_extension_installed
 from .impress import check_slide_numbers_color, compare_pptx_files, check_for_two_lines
diff --git a/desktop_env/evaluators/metrics/general.py b/desktop_env/evaluators/metrics/general.py
index 5b5492e..b0433c3 100644
--- a/desktop_env/evaluators/metrics/general.py
+++ b/desktop_env/evaluators/metrics/general.py
@@ -1,4 +1,5 @@
 import csv
+import json
 import functools
 import operator
 import re
@@ -11,7 +12,7 @@ from lxml.cssselect import CSSSelector
 from lxml.etree import _Element
 from rapidfuzz import fuzz
 
-from .utils import _match_record
+from .utils import _match_record, _match_value_to_rule
 
 import sqlite3
 
@@ -153,3 +154,44 @@ def run_sqlite3(result: str, rules: Dict[str, Any]) -> float:
     connection: sqlite3.Connection = sqlite3.connect(result)
     cursor: sqlite3.Cursor = connection.execute(rules["sql"])
     return float(cursor.fetchone()[0] or 0)
+
+def check_json(result: str, rules: Dict[str, List[Dict[str, Union[List[str], str]]]]) -> float:
+    """
+    Args:
+        result (str): path to json file
+        rules (Dict[str, List[Dict[str, Union[List[str], str]]]]): dict like
+          {
+            "expect": [
+                {
+                    "key": list of str
+                    "method": str
+                    "ref": something
+                }
+            ],
+            "unexpect": <the same as `expect`
+          }
+
+    Returns:
+        float
+    """
+
+    if result is None:
+        return 0.
+    with open(result) as f:
+        result: Dict[str, Any] = json.load(f)
+
+    expect_rules = rule.get("expect", {})
+    unexpect_rules = rule.get("unexpect", {})
+
+    metric = True
+    for r in expect_rules:
+        value = result
+        for k in r["key"]:
+            value = value[k]
+        metric = metric and _match_value_to_rule(value, r)
+    for r in unexpect_rules:
+        value = result
+        for k in r["key"]:
+            value = value[k]
+        metric = metric and not _match_value_to_rule(value, r)
+    return metric
diff --git a/desktop_env/evaluators/metrics/thunderbird.py b/desktop_env/evaluators/metrics/thunderbird.py
index ce7d00d..d0d3f85 100644
--- a/desktop_env/evaluators/metrics/thunderbird.py
+++ b/desktop_env/evaluators/metrics/thunderbird.py
@@ -1,35 +1,16 @@
-from typing import List, Pattern, Dict, Match, Tuple
-from typing import Union, Any, Optional, Iterable, TypeVar, Callable
+from typing import List, Pattern, Dict, Match
+from typing import Union, Any, TypeVar, Callable
 
 import re
-import functools
-import operator
 import json
 from .utils import _match_record
+from .utils import _match_value_to_rule as _match_pref
 
 import logging
 logger = logging.getLogger("desktopenv.metric.thunderbird")
 
 V = TypeVar("Value")
 
-def _match_pref(value: Any, rule: Dict[str, Union[str, Any]]) -> bool:
-    #  function _match_pref {{{ # 
-    if rule["method"].startswith("re"):
-        flags: List[str] = rule["method"].split(".")[1:]
-        flags: Iterable[re.RegexFlag] = (getattr(re, fl) for fl in flags)
-        flag: re.RegexFlag = functools.reduce(operator.or_, flags, re.RegexFlag(0))
-        logger.debug("REFLAG: %s", repr(flag))
-
-        match_: Optional[Match[str]] = re.search(rule["ref"], value, flag)
-        return match_ is not None
-    if rule["method"] in { "eq", "ne"
-                         , "le", "lt"
-                         , "ge", "gt"
-                         }:
-        return getattr(operator, rule["method"])(value, rule["ref"])
-    raise NotImplementedError()
-    #  }}} function _match_pref # 
-
 _pref_pattern: Pattern[str] = re.compile(r'^user_pref\("(?P<key>(?:[^"]|\\")+)\", (?P<val>.+)\);$');
 def check_thunderbird_prefs(result: str, rule: Dict[str, Dict[str, Dict[str, Any]]]):
     """
@@ -148,9 +129,9 @@ def check_thunderbird_filter(result: str, rules: Dict[str, List[Dict[str, str]]]
     return float(all(expect_metrics) and unexpect_metric)
 
 if __name__ == "__main__":
-    import lxml.etree
-    from lxml.cssselect import CSSSelector
-    from lxml.etree import _Element
+    #import lxml.etree
+    #from lxml.cssselect import CSSSelector
+    #from lxml.etree import _Element
 
     #xml = "../../任务数据/Thunderbird/vertical-card-view.xml"
     #xml = "../../任务数据/Thunderbird/vertical-table-view.xml"
diff --git a/desktop_env/evaluators/metrics/utils.py b/desktop_env/evaluators/metrics/utils.py
index 2ab945c..4e5e990 100644
--- a/desktop_env/evaluators/metrics/utils.py
+++ b/desktop_env/evaluators/metrics/utils.py
@@ -1,8 +1,11 @@
 import logging
 import zipfile
-from typing import Any
-from typing import Dict, List, Set
+from typing import Any, TypeVar, Union, Iterable, Optional
+from typing import Dict, List, Set, Match
 from urllib.parse import urlparse, urlunparse
+import re
+import functools
+import operator
 
 import lxml.cssselect
 import lxml.etree
@@ -13,6 +16,8 @@ from openpyxl import Workbook
 from openpyxl.chart._chart import ChartBase
 from openpyxl.worksheet.worksheet import Worksheet
 
+V = TypeVar("Value")
+
 logger = logging.getLogger("desktopenv.metrics.utils")
 
 _xlsx_namespaces = [("x14", "http://schemas.microsoft.com/office/spreadsheetml/2009/9/main")
@@ -133,6 +138,34 @@ def load_charts(xlsx_file: Workbook, **options) -> Dict[str, Any]:
 def _match_record(pattern: Dict[str, Any], item: Dict[str, Any]) -> bool:
     return all(k in item and item[k] == val for k, val in pattern.items())
 
+def _match_value_to_rule(value: V, rule: Dict[str, Union[str, V]]) -> bool:
+    """
+    Args:
+        value (V): value to match
+        rule (Dict[str, Union[str, V]]): rule dict like
+          {
+            "method": str
+            "ref": V as ref value
+          }
+
+    Returns:
+        bool
+    """
+
+    if rule["method"].startswith("re"):
+        flags: List[str] = rule["method"].split(".")[1:]
+        flags: Iterable[re.RegexFlag] = (getattr(re, fl) for fl in flags)
+        flag: re.RegexFlag = functools.reduce(operator.or_, flags, re.RegexFlag(0))
+        logger.debug("REFLAG: %s", repr(flag))
+
+        match_: Optional[Match[str]] = re.search(rule["ref"], value, flag)
+        return match_ is not None
+    if rule["method"] in { "eq", "ne"
+                         , "le", "lt"
+                         , "ge", "gt"
+                         }:
+        return getattr(operator, rule["method"])(value, rule["ref"])
+    raise NotImplementedError()
 
 def are_lists_equal(list1, list2, comparison_func):
     # First check if both lists have the same length
diff --git a/evaluation_examples/examples/thunderbird/480bcfea-d68f-4aaa-a0a9-2589ef319381.json b/evaluation_examples/examples/thunderbird/480bcfea-d68f-4aaa-a0a9-2589ef319381.json
new file mode 100644
index 0000000..7e95acb
--- /dev/null
+++ b/evaluation_examples/examples/thunderbird/480bcfea-d68f-4aaa-a0a9-2589ef319381.json
@@ -0,0 +1,80 @@
+{
+	"id": "480bcfea-d68f-4aaa-a0a9-2589ef319381",
+	"snapshot": "thunderbird",
+	"instruction": "I've got a bunch of email accounts in Thunderbird, and it's a hassle to check them one by one. Can you show me how to set up a unified inbox so I can see all my emails in one place?",
+	"source": "https://www.reddit.com/r/Thunderbird/comments/182dg5p/unified_inbox_howto/",
+	"config": [
+		{
+			"type": "download",
+			"parameters": {
+				"files": [
+					{
+						"url": "https://drive.usercontent.google.com/download?id=1EHLRWzBCOsyERkSMUnTF2pnsR0n6ZvtR&export=download&authuser=0&confirm=t&uuid=de09bd5e-bef8-499a-b599-c642af190e10&at=APZUnTXqOsQkxl0zMSX6R1Sgp_v3:1704362491712",
+						"path": "/home/user/thunderbird-profile.tar.gz"
+					}
+				]
+			}
+		},
+		{
+			"type": "execute",
+			"parameters": {
+				"command": [
+					"tar",
+					"-xzv",
+					"--recursive-unlink",
+					"-f",
+					"/home/user/thunderbird-profile.tar.gz",
+					"-C",
+					"/home/user/"
+				]
+			}
+		},
+		{
+			"type": "launch",
+			"parameters": {
+				"command": [
+					"/usr/bin/thunderbird"
+				]
+			}
+		}
+	],
+	"trajectory": "trajectories/480bcfea-d68f-4aaa-a0a9-2589ef319381",
+	"related_apps": [
+		"thunderbird"
+	],
+	"evaluator": {
+		"postconfig": [
+			{
+				"type": "command",
+				"parameters": {
+					"command": ["wmctrl", "-xFc", "Mail.thunderbird"],
+					"until": {
+						"returncode": 1
+					}
+				}
+			}
+		],
+		"result": {
+			"type": "vm_file",
+			"path": "/home/user/.thunderbird/t5q2a5hp.default-release/xulstore.json",
+			"dest": "xulstore.json"
+		},
+		"func": "check_json",
+		"expected": {
+			"type": "rule",
+			"rules": {
+				"expect": [
+					{
+						"key": [
+							"chrome://messenger/content/messenger.xhtml",
+							"folderTree",
+							"mode"
+						],
+						"method": "re",
+						"ref": "\\bsmart\\b"
+					}
+				]
+			}
+		}
+	}
+}