Click the Settings button on the top right corner of the extension, then scroll down to find Notifications settings.
Then click on the "Let me decide the types of messages I see" box.
Once the "Let me decide the types of messages I see" box is ticked, you'll see "Allow pop-ups on xxxx" button on the pop-ups when you visit a website.
When this button is enabled, you'll then no longer see this pop-up on this specific website. For example, if you switch the highlighted button OFF on Jstor.com, when you next visit the site, you will no longer see this pop-up. However, you will still see the floating button (which you can then click to see the pop-up again) unless you have disabled this setting.
If you'd like to see the pop-up appearing on the website again, please go back to the Extension settings, scroll down to Notifications setting and remove the highlighted setting under "Sites I've blocked".
