Simplify Costco browser header extraction

browser_session.py

@@ -1,4 +1,5 @@
 import configparser
+import json
 import os
 import shutil
 import sqlite3
@@ -104,6 +105,45 @@ def read_firefox_storage_entries(profile_dir, origin_filters):
     return deduped
 
 
+def storage_entries_for_origin(storage_entries, origin_filters):
+    return [
+        entry
+        for entry in storage_entries
+        if origin_matches(entry.origin, origin_filters)
+    ]
+
+
+def find_storage_value(storage_entries, origin_filters, key):
+    for entry in storage_entries_for_origin(storage_entries, origin_filters):
+        if entry.key == key:
+            return entry.value
+    return ""
+
+
+def find_json_storage_value(storage_entries, origin_filters, key, field):
+    raw_value = find_storage_value(storage_entries, origin_filters, key)
+    if not raw_value:
+        return ""
+    try:
+        payload = json.loads(raw_value)
+    except json.JSONDecodeError:
+        return ""
+    value = payload.get(field, "")
+    if value is None:
+        return ""
+    return str(value)
+
+
+def list_storage_keys(storage_entries, origin_filters):
+    return sorted(
+        {
+            entry.key
+            for entry in storage_entries_for_origin(storage_entries, origin_filters)
+            if entry.key
+        }
+    )
+
+
 def read_firefox_ls_entries(profile_dir, origin_filters):
     entries = []
     storage_root = profile_dir / "storage" / "default"