If you have a excel sheet with lot of formula’s and you are trying to audit them, then a simple solution is to press “ctrl+`” (i.e. control key with back tick). This will put the excel sheet in Formula auditing mode and hence all the cells will show the formula rather than the values which will make it easier to audit them. Hope that helps.
If you quickly need to note something and you do not want to leave your browser then just add a bookmark to :
data:text/html, <html contenteditable>
and whenever you need to get the notepad, just open this bookmark. Sorry, I do not remember, where I got this from, but this is something that I did not discover but since I do not remember where I got this from, I am not able to credit the authour.