diff --git a/browser-targets.json b/browser-targets.json
index 32b5df5a..df4a116f 100644
--- a/browser-targets.json
+++ b/browser-targets.json
@@ -1,6 +1,6 @@
 {
     "firefox": {
-        "minimumVersion": "91.1.0",
+        "minimumVersion": "94.0",
         "manifestVersionPath": [
             "applications",
             "gecko",
diff --git a/src/lib/config.ts b/src/lib/config.ts
index 4fbd2921..9de8f064 100644
--- a/src/lib/config.ts
+++ b/src/lib/config.ts
@@ -21,6 +21,8 @@ import * as binding from "@src/lib/binding"
 import * as platform from "@src/lib/platform"
 import { DeepPartial } from "tsdef"
 
+declare function structuredClone<T>(value: T): T // delete me once we move off typescript 3
+
 /* Remove all nulls from objects recursively
  * NB: also applies to arrays
  */
@@ -2205,7 +2207,7 @@ export async function clear() {
  */
 export async function save() {
     const settingsobj = o({})
-    settingsobj[CONFIGNAME] = JSON.parse(JSON.stringify(USERCONFIG))
+    settingsobj[CONFIGNAME] = structuredClone(USERCONFIG)
     return store(() => browser.storage.local.set(settingsobj))
 }