The extension has been removed from the Chrome Web Store, and browsers that already have the extension installed will now have the extension disabled automatically and the warning "This extension contains malware." will be displayed on the Extensions page.
Please note that even though the extension has been disabled, the developer will still have any cookies that were sent while the extension was running. As a result, you should still follow the instructions below!
The "Get cookies.txt" extension is now actively malware. https://old.reddit.com/r/youtubedl/comments/11i5vyq/psa_the_get_cookiestxt_extension_is_now_actively/