Prominently lately, the moment I visit Facebook web pages in general, a pop-up appears.
When it first appeared several months ago, clicking on delete "History" then refreshing the page cleared the pop-up.
Now, the pop-up appears the moment I visit any pages (regardless of whether I use Pale Moon, my preferred browser or Comodo Ice Dragon, so it can't be browser related), regardless of whether I delete my History folder:
When I scroll down the page "See more of..." appears, in this case BBC Radio 2.
See more of BBC Radio 2 by logging in to FacebookMessage this Page, learn about upcoming events and more. If you don't have a Facebook account, you can create one to see more of this Page.
See more of BBC Radio 2 by logging in to Facebook
If I click on "Not Now" the pop-up is moved to the bottom of the screen, but isn't eliminated altogether, unless Facebook have decided to impose this pop-up full-time since.
This web page isn't affected for some reason:
Edited by Castle Robin, 04 June 2016 - 09:50 AM.