For a very long time I have wanted to have a button right on the interface of my Firefox that lets me clear the cache data and cookies with just a click. That way I don't have to waste precious time opening the settings, going to privacy and security, scrolling down and then clearing the cache and cookies. I like to delete my cache and cookies often.
I would try to build a add on for this purpose but I don't know anything about making add-ons for Firefox. I think it would not only be useful for everyone but in particular for web developers who might want to create new server-side sessions often.
It would be so nice if there was a button for that, a short-cut key, or even a button on the main drop down menu. It probably wouldn't be hard to implement. Firefox is my favourite browser for over 10 years. This is the only thing I desperately want. Otherwise I like it a lot.