even if it's not really used anywhere it's a good idea to check it like that

src/boot/after_store.js

@@ -63,10 +63,11 @@ const getInstanceConfig = async ({ store }) => {
       const textlimit = data.max_toot_chars
       const vapidPublicKey = data.pleroma.vapid_public_key
 
+      store.dispatch('setInstanceOption', { name: 'pleromaExtensionsAvailable', value: data.pleroma })
       store.dispatch('setInstanceOption', { name: 'textlimit', value: textlimit })
       store.dispatch('setInstanceOption', { name: 'accountApprovalRequired', value: data.approval_required })
-      store.dispatch('setInstanceOption', { name: 'birthdayRequired', value: !!data.pleroma.metadata.birthday_required })
+      store.dispatch('setInstanceOption', { name: 'birthdayRequired', value: !!data.pleroma?.metadata.birthday_required })
-      store.dispatch('setInstanceOption', { name: 'birthdayMinAge', value: data.pleroma.metadata.birthday_min_age || 0 })
+      store.dispatch('setInstanceOption', { name: 'birthdayMinAge', value: data.pleroma?.metadata.birthday_min_age || 0 })
 
       if (vapidPublicKey) {
         store.dispatch('setInstanceOption', { name: 'vapidPublicKey', value: vapidPublicKey })
@@ -281,7 +282,6 @@ const getNodeInfo = async ({ store }) => {
       const software = data.software
       store.dispatch('setInstanceOption', { name: 'backendVersion', value: software.version })
       store.dispatch('setInstanceOption', { name: 'backendRepository', value: software.repository })
-      store.dispatch('setInstanceOption', { name: 'pleromaBackend', value: software.name === 'pleroma' })
 
       const priv = metadata.private
       store.dispatch('setInstanceOption', { name: 'private', value: priv })

src/components/settings_modal/tabs/security_tab/security_tab.js

@@ -41,8 +41,8 @@ const SecurityTab = {
     user () {
       return this.$store.state.users.currentUser
     },
-    pleromaBackend () {
+    pleromaExtensionsAvailable () {
-      return this.$store.state.instance.pleromaBackend
+      return this.$store.state.instance.pleromaExtensionsAvailable
     },
     oauthTokens () {
       return useOAuthTokensStore().tokens.map(oauthToken => {

src/modules/instance.js

@@ -143,7 +143,7 @@ const defaultState = {
   emoji: {},
   emojiFetched: false,
   unicodeEmojiAnnotations: {},
-  pleromaBackend: true,
+  pleromaExtensionsAvailable: true,
   postFormats: [],
   restrictedNicknames: [],
   safeDM: true,