For uBlock Origin:
Options>”Filter lists”>”Ads”> tick the box that says “Adblock Warning Removal List”
If a warning icon appears beside it, click “Update now” on the top
For AdBlock Plus:
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”
What About Blocking Those Annoying “Give Us Your Email Address To Subscribe” Popups?
If you’re using Ublock Origin, look under “Annoyances” … The “Fanboy’s Annoyance List” does that. Also, the “Fanboy’s Cookie List” should remove these pop-ups for cookies. Note: Ublock collects user data. Consider migrating to uBlock Origin.