Simple To-Do List – Extension for Google Chrome and other Blink-based browsers

I am very old user of the Opera browser (as far as i remember from 2001, then it was the 7th version) and to this day I continue to use it. Since Opera is my most used program every day, so it is convenient to maintain a list of daily tasks right in my favorite browser.
In previous versions of the Opera (I mean Presto based versions – 12 and below) I have used extension for managing task list from another developer. But when I’ve switched on Opera 15 (based on Blink), I have decided to make my own extension, using HTML, CSS and jQuery technologies, which I like very much.