If you click on the "Add to Ninja" add-on button you will get the "Firefox prevented this site from opening a pop-up window" message even if you already have the Bookmark Ninja website in the exception list of the pop-up blocker. This worked fine in version 65 but not in version 66.
I have contacted the Firefox support forum, I will post if I have any updates on this.
There are 2 workarounds to fix the issue:
Turn off the pop-up blocker completely in Firefox (under Options/Privacy & Security/Permissions)
or
Use the "Add to Ninja" bookmarklet instead of the Firefox add-on (you can install it from this page with a simple drag and drop)
Please contact me at support@bookmarkninja.com if you have any questions.
