Donor.world is a fake Adobe Flash Player update alert. It may appear in all popular browsers these days, including Google Chrome, Opera, Mozilla Firefox, Microsoft Edge and even Safari in Mac OS X. These pop-ups try to force you to install plenty of malicious utilities into your computer. These could be browser hijackers, potentially unwanted programs, fake system optimizers, etc. So, you must not tolerate donor.world alerts but rather carefully follow this tutorial below that provides you with ways to fix your system automatically.