diff --git a/docs/configuration.rst b/docs/configuration.rst
index fdae3a99..849fc1e1 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -683,7 +683,7 @@ extractor.*.browser
 Type
     ``string``
 Default
-    * ``"firefox"``: ``artstation``, ``mangasee``, ``twitter``
+    * ``"firefox"``: ``artstation``, ``fanbox``, ``mangasee``, ``twitter``
     * ``null``: otherwise
 Example
     * ``"chrome:macos"``
diff --git a/gallery_dl/extractor/fanbox.py b/gallery_dl/extractor/fanbox.py
index 582086f4..8981c294 100644
--- a/gallery_dl/extractor/fanbox.py
+++ b/gallery_dl/extractor/fanbox.py
@@ -26,6 +26,7 @@ class FanboxExtractor(Extractor):
     directory_fmt = ("{category}", "{creatorId}")
     filename_fmt = "{id}_{num}.{extension}"
     archive_fmt = "{id}_{num}"
+    browser = "firefox"
     _warning = True
 
     def _init(self):