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Now it has become fashionable in the software world to take care of vision and Opera, as we recall, did not stay behind and introduced a dark theme of design. But, we must go further ... I suggest.
When you turn on the night mode, a bright white background, for example as on https://forums.opera.com and other sites with a bright background to do, for example, gray or beige, thus reducing the load on the eyes, also suggest to think how else you can protect your vision when reading at night ...
I Use Opera Touch 1.4, Android 6.0. Crash when trying to search and trying to log on vk.com
Pleace add turbo mode.
Sorry! Write using online translator! 
Lock misses more ads!Allow in ADblock to block ads personally.
Passwords in Opera are stored in not encrypted (add master password).
To enter the setting. Enable HTML5 content that runs automatically (such as youtube) on request.
@heavycloudproton
В опере активна функция дозагрузки фоновых вкладок, возможно Вы оставляете много вкладок и закрываете браузер, а потом при открытии браузера вкладки, которые небыли активны после запуска могут дозагружаться, когда Вы на них переходите...
Если дело не в этом, рекомендую задать вопрос через переводчик на английской ветке форума, там больше шансов что Вам помогут.
I suggest integrating into the browser the automatic translation of pages from English. For example, how it is implemented in Google Chrome. This function is not enough for reading websites. You can integrate an interpreter from Yandex, with whom the Opera has been cooperating for a long time.
I suggest adding the mail.ru agent to the list of supported by the browser(to the left panel).