Safari favicon not updating
To prepare the image to be saved as favicon.ico: If you're using an online service to create your favicon, such as (creates 24bit with a transparent background) or Dynamic Drive, follow the instructions provided by the site and then download the image to your computer.If there is already an old In order for your favicon to show up in some older browsers, you will need to edit your page header.Remember, the best way to edit your theme's files is via a Child Theme.
Some sites load favicons using old html methods and some sites load multiple favicons by examining aspects of the user (e.g., browser). The reason for the time delay from what I've read is to improve the performance of the browser. I believe the reason it isn't updated is he visits the site quite often resetting the favicon expiration time and, even though he deletes history, there can be up to a 24 hour delay before the actual favicon is removed from places.sqlite.
This image will help you understand it better: Most users usually have many tabs open in their browser window.
This hides your website’s title as the number of tabs increase.
They are not changed for 24hours; note, this 24 hour period is bumped every time you visit a page.
You might try, after clearing your history and quitting FF, advancing your computers clock by 48 hours, then start FF and go to the site and see what happens. However, it should definitely delete after 24 hours of not going to the site based on the documentation.
As we mentioned earlier that it establishes your website’s identity.