Firebug is great, but Safari provides its own built-in development tools. If you haven't already tried Safari's development kit, go to Safari-->Preferences-->Advanced, and check the box next to 'Show Develop menu in menu bar'.
FireBug is a really good add-on for Firefox that allows you to depurate the code of your webapps without having to close Firefox. Thanks to Firebug, you will be able to edit HTML code and check how it works instantaneously, without having to reload. That same action can be performed on stylesheets (CSS) and you'll also check changes on the fly.
Effra Font Free Download For Mac more. Always at your service Firebug is always just a keystroke away, but it never gets in your way. You can open Firebug in a separate window, or as a bar at the bottom of your browser. Firebug also gives you fine-grained control over which websites you want to enable it for. Inspect and edit HTML Firebug makes it simple to find HTML elements buried deep in the page.
Did you forget to compress your images? Are your ad partner's servers taking a siesta? Firebug breaks it all down for you file-by-file.