Custom Colour for Weekends in Google Calendar
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This extension lets you choose two custom colours and two custom days, and those days will be coloured with those background colours, finally highlighting your weekend in the Day, Week, Month and Custom views of the NEW version of Google Calendar web pages (2018 and further)!
At first install you will be automatically redirected to options page, where you will have to choose your Google Calendar's page language, the two weekend days and the two colours.
NOTE: sometimes while working it could stop highlighting the weekend columns; in that case, try to click on an empty space on the calendar or press F5 (refresh page) and the weekend columns will be correctly light up again!