Required to make font fingerprinting defenses work.

Index: toolkit/moz.configure
--- toolkit/moz.configure.orig
+++ toolkit/moz.configure
@@ -2218,7 +2218,7 @@ set_config(
 
 @depends(target)
 def bundled_fonts_default(target):
-    return target.os == "WINNT" or target.kernel == "Linux"
+    return target.os == "WINNT" or target.kernel == "Linux" or target.os == "OpenBSD"
 
 
 @depends(build_project)
