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Open the debugger

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To open the debugger, select "Debugger" from the Web Developer submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on OS X), or press Control-Shift-S (Command-Option-S on the Mac).

The Toolbox will appear at the bottom of the browser window, with the Debugger activated. Here's what it looks like when you first open it:

 

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