diff --git a/hosts/common/programs/firefox.nix b/hosts/common/programs/firefox.nix
index 744be195..a8dd50d0 100644
--- a/hosts/common/programs/firefox.nix
+++ b/hosts/common/programs/firefox.nix
@@ -326,7 +326,6 @@ in
           // matrix: for Nheko matrix client
           defaultPref("network.protocol-handler.external.matrix", true);
         '';
-        fs."${cfg.browser.dotDir}/default".dir = {};
         # instruct Firefox to put the profile in a predictable directory (so we can do things like persist just it).
         # XXX: the directory *must* exist, even if empty; Firefox will not create the directory itself.
         fs."${cfg.browser.dotDir}/profiles.ini".symlink.text = ''
@@ -344,24 +343,23 @@ in
         env.PASSWORD_STORE_DIR = "/home/colin/knowledge/secrets/accounts";
         # alternative to PASSWORD_STORE_DIR, but firejail doesn't handle this symlink well
         # fs.".password-store".symlink.target = lib.mkIf cfg.addons.browserpass-extension.enable "knowledge/secrets/accounts";
-      };
-    })
-    (mkIf config.sane.programs.firefox.enabled {
-      # TODO: move the persistence into the sane.programs API (above)
-      # flush the cache to disk to avoid it taking up too much tmp.
-      sane.user.persist.byPath."${cfg.browser.cacheDir}".store =
-        if (cfg.persistData != null) then
-          cfg.persistData
-        else
-          "cryptClearOnBoot"
+
+        # flush the cache to disk to avoid it taking up too much tmp.
+        persist.byPath."${cfg.browser.cacheDir}".store =
+          if (cfg.persistData != null) then
+            cfg.persistData
+          else
+            "cryptClearOnBoot"
         ;
 
-      sane.user.persist.byPath."${cfg.browser.dotDir}/default".store =
-        if (cfg.persistData != null) then
-          cfg.persistData
-        else
-          "cryptClearOnBoot"
+        persist.byPath."${cfg.browser.dotDir}/default".store =
+          if (cfg.persistData != null) then
+            cfg.persistData
+          else
+            "cryptClearOnBoot"
         ;
+      };
+
     })
   ];
 }