diff --git a/src/components/autocomplete/AutoComplete.vue b/src/components/autocomplete/AutoComplete.vue
index ef1410925..1162a6a78 100755
--- a/src/components/autocomplete/AutoComplete.vue
+++ b/src/components/autocomplete/AutoComplete.vue
@@ -738,14 +738,14 @@ export default {
             return this.visibleOptions.findIndex(option => this.isValidOption(option));
         },
         findLastOptionIndex() {
-            return this.visibleOptions.findLastIndex(option => this.isValidOption(option));
+            return ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidOption(option));
         },
         findNextOptionIndex(index) {
             const matchedOptionIndex = index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : index;
         },
         findPrevOptionIndex(index) {
-            const matchedOptionIndex = index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidOption(option)) : -1;
+            const matchedOptionIndex = index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : index;
         },
         findSelectedOptionIndex() {
diff --git a/src/components/cascadeselect/CascadeSelect.vue b/src/components/cascadeselect/CascadeSelect.vue
index e16e3213f..3f0d021bd 100644
--- a/src/components/cascadeselect/CascadeSelect.vue
+++ b/src/components/cascadeselect/CascadeSelect.vue
@@ -547,14 +547,14 @@ export default {
             return this.visibleOptions.findIndex(processedOption => this.isValidOption(processedOption));
         },
         findLastOptionIndex() {
-            return this.visibleOptions.findLastIndex(processedOption => this.isValidOption(processedOption));
+            return ObjectUtils.findLastIndex(this.visibleOptions, processedOption => this.isValidOption(processedOption));
         },
         findNextOptionIndex(index) {
             const matchedOptionIndex = index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(processedOption => this.isValidOption(processedOption)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : index;
         },
         findPrevOptionIndex(index) {
-            const matchedOptionIndex = index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(processedOption => this.isValidOption(processedOption)) : -1;
+            const matchedOptionIndex = index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), processedOption => this.isValidOption(processedOption)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : index;
         },
         findSelectedOptionIndex() {
diff --git a/src/components/dropdown/Dropdown.vue b/src/components/dropdown/Dropdown.vue
index 4aa6bcb27..55e37ae96 100755
--- a/src/components/dropdown/Dropdown.vue
+++ b/src/components/dropdown/Dropdown.vue
@@ -678,14 +678,14 @@ export default {
             return this.visibleOptions.findIndex(option => this.isValidOption(option));
         },
         findLastOptionIndex() {
-            return this.visibleOptions.findLastIndex(option => this.isValidOption(option));
+            return ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidOption(option));
         },
         findNextOptionIndex(index) {
             const matchedOptionIndex = index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : index;
         },
         findPrevOptionIndex(index) {
-            const matchedOptionIndex = index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidOption(option)) : -1;
+            const matchedOptionIndex = index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : index;
         },
         findSelectedOptionIndex() {
diff --git a/src/components/listbox/Listbox.vue b/src/components/listbox/Listbox.vue
index 448960421..0cdece29c 100755
--- a/src/components/listbox/Listbox.vue
+++ b/src/components/listbox/Listbox.vue
@@ -510,28 +510,28 @@ export default {
             return this.visibleOptions.findIndex(option => this.isValidOption(option));
         },
         findLastOptionIndex() {
-            return this.visibleOptions.findLastIndex(option => this.isValidOption(option));
+            return ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidOption(option));
         },
         findNextOptionIndex(index) {
             const matchedOptionIndex = index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : index;
         },
         findPrevOptionIndex(index) {
-            const matchedOptionIndex = index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidOption(option)) : -1;
+            const matchedOptionIndex = index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : index;
         },
         findFirstSelectedOptionIndex() {
             return this.hasSelectedOption ? this.visibleOptions.findIndex(option => this.isValidSelectedOption(option)) : -1;
         },
         findLastSelectedOptionIndex() {
-            return this.hasSelectedOption ? this.visibleOptions.findLastIndex(option => this.isValidSelectedOption(option)) : -1;
+            return this.hasSelectedOption ? ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidSelectedOption(option)) : -1;
         },
         findNextSelectedOptionIndex(index) {
             const matchedOptionIndex = this.hasSelectedOption && index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidSelectedOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : -1;
         },
         findPrevSelectedOptionIndex(index) {
-            const matchedOptionIndex = this.hasSelectedOption && index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidSelectedOption(option)) : -1;
+            const matchedOptionIndex = this.hasSelectedOption && index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidSelectedOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : -1;
         },
         findNearestSelectedOptionIndex(index, firstCheckUp = false) {
diff --git a/src/components/multiselect/MultiSelect.vue b/src/components/multiselect/MultiSelect.vue
index dc77e8a35..e427a4def 100755
--- a/src/components/multiselect/MultiSelect.vue
+++ b/src/components/multiselect/MultiSelect.vue
@@ -795,28 +795,28 @@ export default {
             return this.visibleOptions.findIndex(option => this.isValidOption(option));
         },
         findLastOptionIndex() {
-            return this.visibleOptions.findLastIndex(option => this.isValidOption(option));
+            return ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidOption(option));
         },
         findNextOptionIndex(index) {
             const matchedOptionIndex = index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : index;
         },
         findPrevOptionIndex(index) {
-            const matchedOptionIndex = index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidOption(option)) : -1;
+            const matchedOptionIndex = index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : index;
         },
         findFirstSelectedOptionIndex() {
             return this.hasSelectedOption ? this.visibleOptions.findIndex(option => this.isValidSelectedOption(option)) : -1;
         },
         findLastSelectedOptionIndex() {
-            return this.hasSelectedOption ? this.visibleOptions.findLastIndex(option => this.isValidSelectedOption(option)) : -1;
+            return this.hasSelectedOption ? ObjectUtils.findLastIndex(this.visibleOptions, option => this.isValidSelectedOption(option)) : -1;
         },
         findNextSelectedOptionIndex(index) {
             const matchedOptionIndex = this.hasSelectedOption && index < (this.visibleOptions.length - 1) ? this.visibleOptions.slice(index + 1).findIndex(option => this.isValidSelectedOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex + index + 1 : -1;
         },
         findPrevSelectedOptionIndex(index) {
-            const matchedOptionIndex = this.hasSelectedOption && index > 0 ? this.visibleOptions.slice(0, index).findLastIndex(option => this.isValidSelectedOption(option)) : -1;
+            const matchedOptionIndex = this.hasSelectedOption && index > 0 ? ObjectUtils.findLastIndex(this.visibleOptions.slice(0, index), option => this.isValidSelectedOption(option)) : -1;
             return matchedOptionIndex > -1 ? matchedOptionIndex : -1;
         },
         findNearestSelectedOptionIndex(index, firstCheckUp = false) {
diff --git a/src/components/utils/ObjectUtils.js b/src/components/utils/ObjectUtils.js
index 04e7c6984..a6c217167 100755
--- a/src/components/utils/ObjectUtils.js
+++ b/src/components/utils/ObjectUtils.js
@@ -222,5 +222,24 @@ export default {
 
     isPrintableCharacter(char = '') {
         return this.isNotEmpty(char) && char.length === 1 && char.match(/\S| /);
+    },
+
+    /**
+     * Firefox-v103 does not currently support the "findLastIndex" method. It is stated that this method will be supported with Firefox-v104.
+     * https://caniuse.com/mdn-javascript_builtins_array_findlastindex
+     */
+    findLastIndex(arr, callback) {
+        let index = -1;
+
+        if (this.isNotEmpty(arr)) {
+            try {
+                index = arr.findLastIndex(callback);
+            }
+            catch {
+                index = arr.lastIndexOf([...arr].reverse().find(callback));
+            }
+        }
+
+        return index;
     }
 }