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Toscani toscani

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Open about:config.

Set toolkit.legacyUserProfileCustomizations.stylesheets to true.

Open about:profiles.

Click "Open Folder" on the "Root Directory" row on the profile in use.

Create the folder "chrome".

javascript:void((function(d,w){var%20q=new%20Image;q.src='https://chart.googleapis.com/chart?cht=qr&chs=150x150&chl='+encodeURI(w.location.href);q.style.position='fixed';q.style.top='0';q.style.right='0';q.style.zIndex='9000';q.style.display='inline-block';d.body.insertBefore(q,d.body.firstChild);})(document,window));
javascript:void((function(d){if(self!=top||d.getElementById('toolbar')&&d.getElementById('toolbar').getAttribute('data-resizer'))return%20false;d.write('<!DOCTYPE%20HTML><html%20style="opacity:0;"><head><meta%20charset="utf-8"/></head><body><a%20data-viewport="320x10000"%20data-icon="mobile">(xs)%20Mobile%20Regular</a><a%20data-viewport="767x10000"%20data-icon="mobile">(xs)%20Mobile%20Large</a><a%20data-viewport="991x10000"%20data-icon="small-tablet">(sm)%20Tablet%20Small</a><a%20data-viewport="1199x10000"%20data-icon="tablet">(md)%20Tablet%20Regular</a><script%20src="http://lab.maltewassermann.com/viewport-resizer/resizer.min.js"></script></body></html>')})(document));