closes #24366: reset strict mode after locale read

app/src/androidTest/java/org/mozilla/fenix/perf/StartupExcessiveResourceUseTest.kt

@@ -21,7 +21,7 @@ import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.helpers.HomeActivityTestRule
 
 // BEFORE INCREASING THESE VALUES, PLEASE CONSULT WITH THE PERF TEAM.
-private const val EXPECTED_SUPPRESSION_COUNT = 19
+private const val EXPECTED_SUPPRESSION_COUNT = 20
 @Suppress("TopLevelPropertyNaming") // it's silly this would have a different naming convention b/c no const
 private val EXPECTED_RUNBLOCKING_RANGE = 0..1 // CI has +1 counts compared to local runs: increment these together
 private const val EXPECTED_RECYCLER_VIEW_CONSTRAINT_LAYOUT_CHILDREN = 4

app/src/main/java/org/mozilla/fenix/FeatureFlags.kt

@@ -5,8 +5,10 @@
 package org.mozilla.fenix
 
 import android.content.Context
+import android.os.StrictMode
 import mozilla.components.support.locale.LocaleManager
 import mozilla.components.support.locale.LocaleManager.getSystemDefault
+import org.mozilla.fenix.ext.components
 
 /**
  * A single source for setting feature flags that are mostly based on build type.
@@ -91,9 +93,11 @@ object FeatureFlags {
      * Enables themed wallpapers feature.
      */
     fun isThemedWallpapersFeatureEnabled(context: Context): Boolean {
-        val langTag = LocaleManager.getCurrentLocale(context)
-            ?.toLanguageTag() ?: getSystemDefault().toLanguageTag()
-        return listOf("en-US", "es-US").contains(langTag)
+        return context.components.strictMode.resetAfter(StrictMode.allowThreadDiskReads()) {
+            val langTag = LocaleManager.getCurrentLocale(context)
+                ?.toLanguageTag() ?: getSystemDefault().toLanguageTag()
+            listOf("en-US", "es-US").contains(langTag)
+        }
     }
 
     /**