I use one to get rid of fixed headers on a page

   javascript:(function()%20{%20var%20s,e,i,ee=document.getElementsByTagName('*');%20for(i=0;%20e=ee[i];%20i++)%20{%20s=getComputedStyle(e);%20if%20(s%20&&%20s.position%20==%20'fixed')%20e.style.position='static';%20}%20})();