No issue: Enable about:config in beta builds

app/src/geckoBeta/java/org/mozilla/fenix/engine/GeckoProvider.kt

@@ -44,6 +44,7 @@ object GeckoProvider {
             .crashHandler(CrashHandlerService::class.java)
             .useContentProcessHint(true)
             .telemetryDelegate(GeckoAdapter())
+            .aboutConfigEnabled(Config.channel.isBeta)
             .debugLogging(Config.channel.isDebug)
             .build()
 

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

@@ -40,6 +40,13 @@ enum class ReleaseChannel {
             else -> false
         }
 
+    val isBeta: Boolean
+        get() = when (this) {
+            FennecBeta -> true
+            FenixBeta -> true
+            else -> false
+        }
+
     val isNightlyOrDebug: Boolean
         get() = when (this) {
             FenixNightly -> true