This addon is great. It blocks popup pages without being detected as an ad blocker. Thus, I can still access most services without those sketchy popups. I've been using Popup Blocker (strict) for many years with no issues. I'm glad to see it's still being updated, thanks!
TIP: Note that some sites/services will not deliver some elements (e.g. video download via a file host) unless a certain popup is allowed (i.e. often the last or next to last popup). Yet with Popup Blocker (strict), you can allow the needed popup just long enough for the process to continue, and then the popup is automatically closed. Learning what popup you need to allow involves some trail and error and becoming familiar with the URLs of those popups.