Grammarly extension does not work with Google and Bing translators.
Press Grammarly green button in the left text field (source language to be translated).
Grammarly editor window will pop-up with the following warning: “Looks like you’ve disabled third-party cookies! To use Grammarly editor, please whitelist cookies from Grammarly.”
Whitelisting cookies from Grammarly, Google and complete disabling of all shields and browser restart do not change the situation.
MacOS 10.13.6, Brave 0.63.48
Standalone app.grammarly.com works fine. I do not have this issue in other browsers (checked: Chrome, Firefox, and Safari).