At one point when I was browsing, I accidentally clicked the option to not show me this notification about if I wanted a pop-up to open when I was trying to open a pop-up. Now, I can't find any way to turn the thing back on, and I'm having to manually add websites to pop-up exceptions in the settings, which is super annoying, because I don't even get a notification that a pop-up was blocked if a website was supposed to serve me one that I needed.
I tried Googling, but the only answers are super old and mention some sort of status bar that Firefox no longer even has. So, I don't know what to do to turn this pop-up notification back on!