Surprisingly, the information in the browser itself indicates the year 2019. Of course, the browser is not being developed, but why should the version from 2017 be presented as the 2019 browser?

I have never experienced this problem. Moreover, I was not aware of a similar problem. Because the extension does not affect the closing of multiple tabs at the same time.
This problem is curable if you check Opera settings and turn off this setting. The extension does not set this setting. But Opera itself may change some settings after the update. I've noticed jokes like this.

@aleks72: установите на время microsoft edge (что на хромовом движке), инсталлируйте в него adguard из mirrosoft store, найдите папку с этим расширение в ms edge, скопируйте ее в удобное место, затем инсталлируйте в opera или в янндекс-браузер (смотря что вы используете) из этой папки в режиме разработчика adguard (вытащенный из ms edge), затем деинсталлируйте ms edge, радуйтесь

adguard из ms store блокирует рекламу от яндекса

проверено

Surprisingly, the information in the browser itself indicates the year 2019. Of course, the browser is not being developed, but why should the version from 2017 be presented as the 2019 browser?