The Firebug web development tool, an open source add-on to the Firefox browser, is being discontinued after 12 years, replaced by Firefox Developer Tools.
FIrebug was a chrome extension that was used before but now it is not supported and if you still want to use it then probably you will have to downgrade the chrome version. Firebug is discontinued open-source web browser extension. It was used to inspect element. There is another version i.e. Firebug Lite.
The Chrome Web Inspector and Debugger are conveniently built-in with Chrome. You can launch it by hitting F12 while in your browser or by right clicking on a web page and selecting the Inspect menu item. The images below show a few different views that you'll see in the Chrome DevTools browser.
Press the F12 function key in the Chrome browser to launch the JavaScript debugger and then click "Scripts". Choose the JavaScript file on top and place the breakpoint to the debugger for the JavaScript code.
There is a Firebug-like tool already built into Chrome. Just right click anywhere on a page and choose "Inspect element" from the menu. Chrome has a graphical tool for debugging (like in Firebug), so you can debug JavaScript. It also does CSS inspection well and can even change CSS rendering on the fly.
For more information, see https://developers.google.com/chrome-developer-tools/
Firebug Lite supports to inspect HTML elements, computed CSS style, and a lot more. Since it's pure JavaScript, it works in many different browsers. Just include the script in your source, or add the bookmarklet to your bookmark bar to include it on any page with a single click.
http://getfirebug.com/lite.html
Just adding some talking points as someone who uses Firebug / Chrome Inspector every day:
At the time of writing, there's only Google DOM inspector and no it doesn't have all the features of Firebug
Inspector is a 'lite' version of Firebug: The interface is not as good IMO, element inspection in both recent versions is now clunky, but Firebug is still better; I find myself trying to find the love for Chrome (since it's a better, faster browser experience), but for development work, it still just sucks for me.
Live preview / modification of DOM / CSS is still way better in Firebug; calculated CSS and box model view are better in Firebug;
Somehow it's just easier to read/use Firebug maybe because of the ease of navigating, manipulating/modifying the document in several key areas? Who knows. I'm used to the interface and I think Chrome Inspector is not as good although this is a subjective thing I admit.
The Cookies/Net tab are extremely useful to me in Firebug. Maybe Chrome Inspector has this now? Last time I checked it did not, because Chrome updates itself in the background without your intervention (gets your consent by default like all good overlords).
Last point: The day that Google Chrome gets a fully-featured Firebug is the day Firefox basically dies for developers because Firefox had 3 years to make Firefox's layout engine Gecko as fast as WebKit and they didn't. Sorry to put it so bluntly but it's the truth.
You see, now everyone wants to move away from Flash in lieu of jQuery motivated by mobile accessibility and interactivity (iPhone, iPad, Android) and JavaScript is 'suddenly' a big deal (that's sarcasm), so that ship has sailed, Firefox. And that makes me sad, as a Mozilla fanperson. Chrome is simply a better browser until Firefox upgrades their JavaScript engine.
F12
I love shortkeys
Try this, it's called Firebug Lite and apparently works with the beta version of Chrome.
You can also find it at: https://chrome.google.com/extensions/
You can set this bookmarklet in your "Bookmarks Bar" in order to have Firebug lite always available in Chrome/Chromium browser (put this as the URL):
javascript:var firebug=document.createElement('script');firebug.setAttribute('src','http://getfirebug.com/releases/lite/1.2/firebug-lite-compressed.js');document.body.appendChild(firebug);(function(){if(window.firebug.version){firebug.init();}else{setTimeout(arguments.callee);}})();void(firebug);
Or try user scripts: http://dev.chromium.org/developers/design-documents/user-scripts
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