why do i keep seeing stay on page leave page

ok now every time Firefox updates im on a a page and yes i do have ad ons or extensions which Firefox offers and if we are not supposed to use the why offer them Ill be on a page mostly A Facebook page and it keeps asking me to stay on or leave page on Facebook page stay on page or leave page I try to hit stay on page and i can not i have have to ht leave page what is going on and why i hate this thing why do i have to keep refreshing the page why is this happening do i need to remove the add on you support this is just not right