Netscape 7 and Internet Explorer versions 5 and 6 display the favicon only when the page is bookmarked, and not simply when the page is visited as in later browsers.
The following table illustrates major web browsers supporting different features.
The effected pages are "Main", "Simple", "Expand", "Video" and "FX".
Even more strange is that only one demo page ("CSS3") shows the favicon on the tab and when saved as a bookmark, but none of the other pages will. Oddly, I can't get the favicon to show up in Firefox (try the [ Slider/simple demo] page).
This side effect no longer works, as all modern browsers load the favicon file to display in their web address bar, regardless of whether the site is bookmarked." does not have a meaning in this context.
A side effect was that the number of visitors who had bookmarked the page could be estimated by the requests of the favicon. Oddly, I can't get the favicon to show up in Firefox (try the simple demo page).They show up in webkit browsers and IE without any problems.Chrome for Mac will use whichever favicon is ICO formatted, otherwise the 32×32 favicon.Chrome for Windows will use the favicon that comes first if it is 16×16, otherwise the ICO.Favicons are often manipulated as part of phishing or eavesdropping attacks against HTTPS webpages.Many web browsers display favicons near areas of the web browser's UI, such as the address bar, that are used to convey whether the connection to a website is using a secure protocol like TLS.The version numbers indicate the starting version of a supported feature.The following table illustrates the image file format support for the favicon.By changing the favicon to a familiar padlock image an attacker can attempt to trick the user into thinking they are securely connected to the proper website.Automated man-in-the-middle attack tools such as SSLStrip utilize this trick.