Using any browser for visit of the sites, and having opened in it a large number of tabs, on what you will be guided to get on necessary of open tabs? Everything is right. On the picture icon of the site. It is called as favicon, and has the size 16х16 though it is sometimes used 32х32. 

On style favicon often repeats a site logo with little changes, however there can sometimes be also essential distinctions. For example, all know how looks ravines of Yandex — a red capital letter I. Thus favicon Yandex of the Disk reminds something like an UFO. 

For you it is necessary favicon that at once from all tabs yours was allocated? Address for its development on www.pinofran.com