I had this too - lots of random words underlined and leading to advertising links. Turns out the most recent update I did of Mozilla had this attached to it - but it was easily located in my Programs (as Yontuu) and is gone now....I think!!
You've read the books and watched all the movies, now Harry Potter fans can visit the magical places from the wizarding world in person. Here's 10 of the best Harry Potter destinations every fan should see.