The Moleskin takes a look at some of the top firefox extensions for web development:
Firefox comes with a broad selection of extensions. Some of these extensions are extremely useful for testing and validating your web page.General Hint: Before we start. If at all possible download Firefox extensions directly from the developer’s page. Those are usually updated before the Firefox Add-ons site. All of the extensions discussed work in Firefox 188.8.131.52 or above.