Happened to me on Firefox 45.0 on Windows. But when I restarted it gave a popup saying there was an unresponsive script and asking if I wanted to stop it. Scr

Happened to me on Firefox 45.0 on Windows. But when I restarted it gave a popup saying there was an unresponsive script and asking if I wanted to stop it. Script: data:application/x-javascript;…B9XX0se30sWzMxMV0pKDMxMSl9KTs=:40