Right click the extension icon and then Options. A new tab will open.
You’ll see a few sub-tabs, click on “Filter lists”
Under “Ads”, tick the box that says “Adblock Warning Removal List”
If a warning icon appears beside it, click “Update now” on the top
Options > Advanced > Filter Lists > Adblock Warning Removal List > Active
Ad Blocker > Scroll down to add filter > AdBlock Warning Removal List is down under annoyances
Enable “Adblock Warning Removal List” under “3rd party lists”