Піктограма Tab notifier

Tab notifier 3.1 Сумісно починаючи з Firefox 57

автор Giuseppe Angelone

Enables desktop notifications like in Chrome (e.g. Gmail, imo.im) and, if the site doesn't support them, it can notify new messages or updates detecting changes of the title (e.g. Hotmail, Yahoo, Facebook, Twitter). Even if the browser is minimized!