fix: remove firefox pinned tab function and return if doc hidden

app/assets/javascripts/strings.ts

@@ -13,6 +13,7 @@ export const STRING_NEW_UPDATE_READY = "A new update is ready to install. Please
 export const STRING_DELETE_TAG = "Are you sure you want to delete this tag? Note: deleting a tag will not delete its notes.";
 
 /** @editor */
+export const STRING_SAVING_WHILE_DOCUMENT_HIDDEN = 'Attempting to save an item while the application is hidden. To protect data integrity, please refresh the application window and try again.'
 export const STRING_DELETED_NOTE = "The note you are attempting to edit has been deleted, and is awaiting sync. Changes you make will be disregarded.";
 export const STRING_INVALID_NOTE = "The note you are attempting to save can not be found or has been deleted. Changes you make will not be synced. Please copy this note's text and start a new note.";
 export const STRING_ELLIPSES = "...";

app/assets/javascripts/views/editor/editor_view.ts

@@ -1,3 +1,4 @@
+import { STRING_SAVING_WHILE_DOCUMENT_HIDDEN } from './../../strings';
 import { Editor } from '@/ui_models/editor';
 import { WebApplication } from '@/ui_models/application';
 import { PanelPuppet, WebDirective } from '@/types';
@@ -437,17 +438,6 @@ class EditorViewCtrl extends PureViewCtrl<{}, EditorState> {
       extensionsInContextOfItem(this.note).length > 0;
   }
 
-  performFirefoxPinnedTabFix() {
-    /**
-     * For Firefox pinned tab issue:
-     * When a new browser session is started, and SN is in a pinned tab,
-     * SN is unusable until the tab is reloaded.
-     */
-    if (document.hidden) {
-      window.location.reload();
-    }
-  }
-
   /**
    * @param bypassDebouncer Calling save will debounce by default. You can pass true to save
    * immediately.
@@ -468,7 +458,12 @@ class EditorViewCtrl extends PureViewCtrl<{}, EditorState> {
     customMutate?: (mutator: NoteMutator) => void,
     closeAfterSync = false
   ) {
-    this.performFirefoxPinnedTabFix();
+    if (document.hidden) {
+      this.application.alertService!.alert(
+        STRING_SAVING_WHILE_DOCUMENT_HIDDEN
+      );
+      return;
+    }
     const note = this.note;
     if (note.deleted) {
       this.application.alertService!.alert(