If you still need to use Java, share a comment below in which you let us know which sites and web pages still require Java. Only older browsers like Internet Explorer still support Java applets today.
While some web browsers like Google Chrome, Mozilla Firefox and Opera stopped supporting Java applets, others never supported them, like Microsoft Edge. Java had quite a significant market share in the past. The next time you load a web page in Opera that uses Java, click or tap the 'e' button from the top-right corner. If you see it, click or tap Run to continue. It is an executable file that is required by IE Tab to run and do its job If you want all the details on why IE Tab needs this file, you can read the 'What? Windows may show a security warning. Then, click or tap the 'e' icon and IE Tab downloads a file called ietabhelper.
Press the Install button, and then confirm the installation by clicking 'Yes, install. You see the IE Tab extension on the list. Opera opens a new tab with all installed extensions. Opera tells you that to complete the installation, you must go to the extensions manager and click the install button. Click or tap the 'Add to Opera' button from the top right. This extension lets you download, install and use any extension from the Chrome Web Store in your Opera browser.