Adding to that is a design error in my opinion. Correcting typos in the middle or at the beginning of a phrase does not reload the search results immediately. You can try that out for yourself by typing in Mozzilla in the location bar and delete the second z after typing that phrase. Firefox will not reload the results. The only way to reload the results is to add a blank after the phrase that has been entered.

Edit Middle is a Firefox add-on that corrects this. It refreshes search results if a word has been edited and this time it does not matter if the word has been edited in the beginning, middle or end. If you make typos from time to time you will love this add-on.