Some Simple JavaScript Hacks :]

#1. Go to any webpage, [preferably MPGH] and paste this:

Code:

javascript:document.body.contentEditable='true'; document.designMode='on'; void 0

Now you can finally edit to your lieks

Ofc it's permanent

#2. Go to this webpage : This [preferably]

And paste this in:

Code:

javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.images; DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+"px"; DIS.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+"px"}R++}setInterval('A()',5); void(0);

Let's seee them spinnnnnnnn

#3. The never closing box! As the title suggests, it'll make a box pop up and the only way to close is to restart the browser

Code:

javascript:while(1){alert('Restart your browser to close this box!')}

In the 'Restart your browser to close this box!' , type in your own message

#4. The Calculator!

Code:

javascript: alert(123+901-23512+9);

Post the stuff you want in the () area.

#5. Fake website detector. In case you don't trust a website if it looks sketchy, try this handy guy:

Code:

javascript:var i,s,ss=['http://kathack.com/js/kh.js','http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js'];for(i=0;i!=ss.length;i++){s=document.createElemen t('script');s.src=ss[i];document.body.appendChild(s);}void(0);

#6. This is from derpderp who wanted me to post this too :3 It's the in-game kamatari

Code:

javascript:var h='http://174.129.249.239/js/',i,n,ss=['http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js',h+'Renderables.js',h+'Game.js'];for(i=0;i<ss.length;i++){n=document.createElement ("script");n.src=ss[i]+'?'+Date.now();document.head.appendChild(n);}

It basically: "turns everything on the page into a katamari game. You just paste a code into your URL, and start playing. Its actually kinda funny. Not the most fun, but its worth a try."
~quote from @Heartview <3