diff --git a/docs/configuration.rst b/docs/configuration.rst
index 5f8ac6eb..ddb028ef 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -534,7 +534,7 @@ extractor.*.user-agent
 Type
     ``string``
 Default
-    ``"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:115.0) Gecko/20100101 Firefox/115.0"``
+    ``"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0"``
 Description
     User-Agent header value to be used for HTTP requests.
 
diff --git a/docs/gallery-dl.conf b/docs/gallery-dl.conf
index b5efc734..6f397e68 100644
--- a/docs/gallery-dl.conf
+++ b/docs/gallery-dl.conf
@@ -10,7 +10,7 @@
         "proxy": null,
         "skip": true,
 
-        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:115.0) Gecko/20100101 Firefox/115.0",
+        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0",
         "retries": 4,
         "timeout": 30.0,
         "verify": true,
diff --git a/gallery_dl/extractor/common.py b/gallery_dl/extractor/common.py
index 660f9551..6f48e49d 100644
--- a/gallery_dl/extractor/common.py
+++ b/gallery_dl/extractor/common.py
@@ -299,7 +299,7 @@ class Extractor():
             useragent = self.config("user-agent")
             if useragent is None:
                 useragent = ("Mozilla/5.0 (Windows NT 10.0; Win64; x64; "
-                             "rv:115.0) Gecko/20100101 Firefox/115.0")
+                             "rv:109.0) Gecko/20100101 Firefox/115.0")
             elif useragent == "browser":
                 useragent = _browser_useragent()
             headers["User-Agent"] = useragent
@@ -831,8 +831,8 @@ _browser_cookies = {}
 
 HTTP_HEADERS = {
     "firefox": (
-        ("User-Agent", "Mozilla/5.0 ({}; rv:115.0) "
-                       "Gecko/20100101 Firefox/115.0"),
+        ("User-Agent", "Mozilla/5.0 ({}; "
+                       "rv:109.0) Gecko/20100101 Firefox/115.0"),
         ("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,"
                    "image/avif,image/webp,*/*;q=0.8"),
         ("Accept-Language", "en-US,en;q=0.5"),