Bold English font in Opera. How to be?

Question

Browsers

Opera has been updated to version 39.0 and everything that is not typed in Cyrillic has become bold. Everywhere, on all sites - brackets, quotation marks, all punctuation marks and any Latin text - became bold. This is exactly in this version of the opera, because this has not been noticed before.
The system fonts used by the opera by default have not changed. Just updated the browser.
This is very annoying when you read the Russian text, and the bracket or quote is bold, and you think either on the site like this, or the browser.
Who, what can say about this?

Answer 1

maybe changed the browser settings? Font.

Answer 2

Your Helvetica font is set to Bold/Bold. Remove it and everything will be fine.
By the way, to remove it, you need to close all programs where it is used: the browsers themselves, Skype, Torrent, etc. After deleting, restart the browser and everything will be fine. m