1 - 4Chan's FF Addon.
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as a sysadmin I have to help developers check everything and so I use webdev', 3 headers addons, tamper data, firebug... and some more :)
I have several, but my favorite is Roboform.
I use the important ones ;D.
Ad Block Plus, No Script, Grand Central Click To Call, Firebug, Tamper Data, Stylish, StumbleUpon, IETab, FireFTP, DownThemAll, and WebDeveloper toolbar.