This is a super simple bookmarklet that removes furigana when you click it. If you want to show the furigana again, you just reload the webpage. That’s all there really is to it!
EDIT:
This old forum post appears to have a more advanced furigana toggle bookmarklet, but the link to where the source code is supposed to be is broken and does not work anymore.
This is the one I’m currently using which is now updated from the one I posted on the old forum. Toggles Furigana on NHK, Jisho.org and most recently Itazuraneko Grammar.
javascript:(function(){var x,title=window.location.href,mode=“visible”;if (title.indexOf(“jisho.org”)>0) { x=document.getElementsByClassName(“furigana”);} else if ((title.indexOf(“nhk.or.jp”)>0) || (title.indexOf(“itazuraneko”)>0)) { x=document.getElementsByTagName(“rt”);} else { return;} if (x[0].style.visibility!=“hidden”) { mode=“hidden”;} for (i = 0; i < x.length; i++) { x[i].style.visibility=mode;}})(); void(0);
I also like to toggle the English on jisho.org sentences too:
javascript:(function(){var x,title=window.location.href,mode=“visible”;if (title.indexOf(“jisho.org”)>0) { x=document.getElementsByClassName(“english”);} if (x[0].style.visibility!=“hidden”) { mode=“hidden”;} for (i = 0; i < x.length; i++) { x[i].style.visibility=mode;}})(); void(0);