When I open a new tab, a pop-up window opens immediately after. It's always the same pop-up window that leads to our company page. I can disable it by removing extension in settings pop-up blocker. But I do need to use that web page from time to time. Tried to google it , searched forum, but didn't find anything helpful. Any suggestions? I think it appeared after upgrading FF to some of the latest versions several weeks ago. Now, I have 45.0.2, so it might have been showing this problem since version 45.