Thanks for that good add-on, it is very useful but can be more,
You know, most developers are using offline testing for their system (such as Xamp,Wamp,ISS...) and when we are testing our codes in browser we usually want to edit source code directly.
Your add-on copies source file in "temp. directory" and open from there (so there is no chance to edit and save back original files in localhost) but if there is an option (if file is located in localhost, open from there) to allow for editing original file, then this add-on becomes awsome..
Thanks for your effort again.