Incognito mode/private window is a setting on your web browser which doesn’t keep a record of the web pages you visit and does not use any of the existing cache or cookies from the browser. This is a useful tool when you made a change on your browser and you do no see it when you visit it. Using this it will tell you if the issue is just you browser cache or something else.
Every browser has a different name for the setting. In Chrome it is Incognito Mode, in Microsoft Edge it is InPrivate Mode, in Safari it is Private Browsing and in Firefox it is Private Window.
How open an incognito window?
Click button in your browser you’d usually use to open a new tab (typically three vertical dots or lines in the top right-hand corner) and select "open new private/incognito tab". Everything you do in that new tab(s) will go unrecorded by your browser.
FireFox
Google Chrome
Incognito mode runs in a separate tab from your normal browser tabs. If you have an Incognito tab open and you open another one, your private browsing session will continue in the new tab. To exit Incognito mode, close all Incognito tabs.