In some situations, disabling and then enabling the Lean Library extension is necessary to reload the Extension settings.
You should be able to see a toggle button on the top right corner when you see the pop-up, you can simply toggle it off and on to force the extension to restart:
Or alternatively, please follow the steps below to disable/enable your extension:
Firefox
1: Please press Ctrl + Shift + A
2: Enable/disable the extension by clicking on the button twice
Google Chrome
1: Place chrome://extensions/ into the search bar, then click enter
2: Enable/disable the extension by clicking on the button twice
Opera
1: Please press Ctrl + Shift + E
2: Click "enable" and "disable"
Microsoft Edge
1: Click on the three dots menu in the top right corner, and select "Extensions" from the list
2: Click "Off" and "On"
Safari
1: Go to Safari and then Preferences (cmd + ,)
2: Select "Extensions" on the preferences menu
3: Check and uncheck the box next to the Lean Library extension