Here's one of many perks when using F.D.E: To unify settings, you can use Firefox sync. will be a completely UN-customized browser. Meaning you can have both Firefox or F-beta, installed next to the developer edition. It uses a separate profile than the regular version of Firefox.

Have fun and this is end of Instructions.The Firefox Developer Edition is a modified version of Firefox, specifically designed for web developers.

It is super useful for Javascript coders. You could add or remove breakpoints and watch the values of different variables. You could do mouse over to a perticular variable and you could validate from there and on the right panel. It dynamically breaks to the line you set the breakpointes. Now you are ready to debug the Javascript step by step by clicking on the buttons on upper right corner. And put the breakpoints on the left like below: You now see the buttons on the upper right corner are still greyed out because you have not invoke anything on the current web page.Īnd when you invoke the corresponding fields on the webpage. Say I navigate to the Javascript for senstive area that I would assume where a problem would be. When you choose Script, you have to click the blue link : Enable Normally firebug would show up at the bottom. However you could only debug one Javascript a time for one session. You could find a small icon aside on the right corner of the browser and once you click that button, the firebug is invoked. Now you have firebug installed, you could start using firebug to debug the Javascript. And then click Install besides the plugin. Go to General and then click Manage Add-ons Open Firefox browser and go to Tools-> Options

Once you get your firefox browser, you could then download firebug within the browser.

Firebug download for firefox 27