add icon to website tab
Convert your image to .ico (use https://hnet.com/png-to-ico/)
Rename your ico to favicon
add this to the <head>: <link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />
how to add icon to custom page tab
<link rel="icon" href="http://example.com/favicon.png">
how to add an icon to your website tab
<head>
<link rel="shortcut icon" type="image/x-icon" href="yourimagehere">
</head>
*supported files are .ico .png or .gif
Source: stackoverflow.com
add icon to website tab
<link rel="shortcut icon" type="image/x-icon" href="favicon.ico" />