diff --git a/searx/data/currencies.py b/searx/data/currencies.py
index 0721037a1..504f43ae5 100644
--- a/searx/data/currencies.py
+++ b/searx/data/currencies.py
@@ -24,8 +24,9 @@ class CurrenciesDB:
 
     def init(self):
         if self.cache.properties("currencies loaded") != "OK":
-            self.load()
+            # To avoid parallel initializations, the property is set first
             self.cache.properties.set("currencies loaded", "OK")
+            self.load()
         # F I X M E:
         #     do we need a maintenance .. rember: database is stored
         #     in /tmp and will be rebuild during the reboot anyway
diff --git a/searx/data/tracker_patterns.py b/searx/data/tracker_patterns.py
index f269b8395..04776b5a5 100644
--- a/searx/data/tracker_patterns.py
+++ b/searx/data/tracker_patterns.py
@@ -7,7 +7,6 @@ import typing
 __all__ = ["TrackerPatternsDB"]
 
 import re
-import pathlib
 from collections.abc import Iterator
 from urllib.parse import urlparse, urlunparse, parse_qsl, urlencode
 
@@ -22,7 +21,6 @@ class TrackerPatternsDB:
     # pylint: disable=missing-class-docstring
 
     ctx_name = "data_tracker_patterns"
-    json_file = pathlib.Path(__file__).parent / "tracker_patterns.json"
 
     CLEAR_LIST_URL = [
         # ClearURL rule lists, the first one that responds HTTP 200 is used
@@ -42,8 +40,9 @@ class TrackerPatternsDB:
 
     def init(self):
         if self.cache.properties("tracker_patterns loaded") != "OK":
-            self.load()
+            # To avoid parallel initializations, the property is set first
             self.cache.properties.set("tracker_patterns loaded", "OK")
+            self.load()
         # F I X M E:
         #     do we need a maintenance .. rember: database is stored
         #     in /tmp and will be rebuild during the reboot anyway
diff --git a/searx/plugins/tracker_url_remover.py b/searx/plugins/tracker_url_remover.py
index b7e8e25f3..190744586 100644
--- a/searx/plugins/tracker_url_remover.py
+++ b/searx/plugins/tracker_url_remover.py
@@ -13,6 +13,7 @@ from searx.data import TRACKER_PATTERNS
 from . import Plugin, PluginInfo
 
 if typing.TYPE_CHECKING:
+    import flask
     from searx.search import SearchWithPlugins
     from searx.extended_types import SXNG_Request
     from searx.result_types import Result, LegacyResult
@@ -37,6 +38,10 @@ class SXNGPlugin(Plugin):
             preference_section="privacy",
         )
 
+    def init(self, app: "flask.Flask") -> bool:
+        TRACKER_PATTERNS.init()
+        return True
+
     def on_result(self, request: "SXNG_Request", search: "SearchWithPlugins", result: Result) -> bool:
 
         result.filter_urls(self.filter_url_field)
diff --git a/searx/search/processors/online_currency.py b/searx/search/processors/online_currency.py
index 0d7900616..4a56fd05c 100644
--- a/searx/search/processors/online_currency.py
+++ b/searx/search/processors/online_currency.py
@@ -24,6 +24,10 @@ class OnlineCurrencyProcessor(OnlineProcessor):
 
     engine_type = 'online_currency'
 
+    def initialize(self):
+        CURRENCIES.init()
+        super().initialize()
+
     def get_params(self, search_query, engine_category):
         """Returns a set of :ref:`request params <engine request online_currency>`
         or ``None`` if search query does not match to :py:obj:`parser_re`."""