Google Chrome extensions can be used in other browsers too which are based on Chromium framework.
The process will be the same as that of installing inÂ Google Chrome. Add and install.
For Opera, to do this, first an add-on which will enable this needs to be installed. This is an official add-on which can be downloaded and installed from here.
Once installed, go to Chrome Web Store and choose the extensions required. They will be now listed as Add to Opera instead of Chrome.
Choose them and install.
After they are installed, use Opera Extension Manager to enable them.
From now on, enjoy the useful Chrome extensions even in Opera browser.
If you want to install extensions in Brave browser, click on the menu button and select Extensions.
Alternatively, directly go to the Chrome Web Store and click on the Add to Brave button next to the extensions.
Here is a useful resource on privacy and other considerations before adding any new extensions to the Brave browser.