An example of where this extension might prove useful is while writing forum posts. Perhaps after writing a lengthy post you realise that you have repeatedly spelled something wrong that isn't picked up by spell check, such as the name of an organisation. All you need to do to replace the mistake on the page is click the magnifying glass icon, type in the text you want to search for and the text you want to replace it with, and hit the "Go" button. The text will be changed in all input boxes on the page. It is currently case-insensitive so I may add functionality to allow this to be turned off or on. You can get the extension here. If it doesn't work, leave a comment saying so! You can see a video of it in action here.