Setting custom cookies in firefox and chrome?

Question

Is there a way to add a cookie in these? Like "debug=true" and that way my website can test for that?

I'm meaning to be able to use the ui of the browser.

Maybe a plugin/extension?

Basically, I want to be able to test certain features without anyone else seeing them.

Answer 1

In firefox there is the "Web Developer" plugin. It allows you to add arbitrary cookies among MANY other things that are great for web development.

Once installed, go to the cookie menu-> add cookie and fill in the information.