diff --git a/README.md b/README.md
index 4528d72..4010a14 100644
--- a/README.md
+++ b/README.md
@@ -13,7 +13,7 @@ hack-browser-data is an open-source tool that could help you export data from br
 | Edge [MacOS]<br />(require password)   |    ✅    |   ✅   |    ✅    |    ✅    |
 | 360 Speed Browser [Windows]        |    ✅    |   ✅   |    ✅    |    ✅    |
 | QQ Browser [Windows]                |    ✅    |   ✅   |    ✅    |    ✅    |
-| FireFox [MacOS]    |   ✅   |   ✅   |    ✅    |    ✅    |
+| FireFox [MacOS]    |   ✅   |   ❌   |    ❌    |    ❌    |
 | FireFox [Windows]    |    ❌    |   ❌   |    ❌    |    ❌    |
 | Safari [MacOS]                      |    ❌    |   ❌   |    ❌    |    ❌    |
 | Internet Explorer [Windows]         |    ❌    |   ❌   |    ❌    |    ❌    |
diff --git a/utils/utils.go b/utils/utils.go
index 6ab277d..70730af 100644
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -149,3 +149,15 @@ func MakeDir(dirName string) {
 		err = os.Mkdir(dirName, 0700)
 	}
 }
+
+func paddingZero(s []byte, l int) []byte {
+	h := l - len(s)
+	if h <= 0 {
+		return s
+	} else {
+		for i := len(s); i < l; i++ {
+			s = append(s, 0)
+		}
+		return s
+	}
+}