I've tried forums.opera.com, but it just works for me. However, I can see the problem by loading other sites that contains some problematic elements.
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RE: Browser Extension allows GoogleOpera for Linux
This is not related to adblocker. It's one of built in extensions which allows context menu copy/paste to work on docs.google.com. In non chromium browser a popup appears asking to install chrome extension to allow this. To avoid this popup Opera uses built in extension to allow this, which has a drawback of adding this enforced permissions.
Opera for Android 51 - built-in VPNOpera for Android
We are happy to announce the release of Opera for Android 51 (51.1.2461.137501). This version introduces built-in VPN support, crypto-pairing with the latest version of Opera for computers (R3+), and speech-to-text input support.
- Improvements to the fast scroller
- Improved startup time
- Chromium 72
Please try the new version and leave a comment with any feedback you may have for us.
We're gradually rolling out the new version with VPN support. It will be available to all users within a week.