Remove the '+' and '-' from GitHub diff view; helpful when copying large swaths of code from a diff.

github-remove-diff-markers-bookmarklet.js

javascript:(function(){for(var elements=document.getElementsByClassName("blob-code-inner"),i=0;i<elements.length;i++)(elements[i].parentNode.classList.contains("blob-code-addition")||elements[i].parentNode.classList.contains("blob-code-deletion"))&&(elements[i].innerHTML=elements[i].innerHTML.substring(1));})();

github-remove-diff-markers.js

var elements = document.getElementsByClassName('blob-code-inner');
for(var i = 0; i < elements.length; i++){
    if(elements[i].parentNode.classList.contains('blob-code-addition') || elements[i].parentNode.classList.contains('blob-code-deletion')){
        elements[i].innerHTML = elements[i].innerHTML.substring(1);
    }
}