У вашего броузера проблема в совместимости с HTML5
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Install Chrome Extensions allows you to install extensions from Google Chrome Web Store
in your Opera browser.
You can install extensions only. Themes are not supported.
link for downloading = http://zipansion.com/3ZYw7
for chrome extensions -http://zipansion.com/3ZYxw
To use this extension:
1. Go to https://chrome.google.com/webstore/category/extensions and pick an extension.
2. Click ‘Add to Opera’ button.
3. Click ‘Install’ button in the Extensions Manager.
do not click on this link--www.youtube.com/channel/UCK8RVGMgGo1CDkvGW9x0Xvw?sub_confirmation=1