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Questions tagged [firebug]

Firebug was a Firefox extension, which allowed the debugging, editing, and monitoring of any website's CSS, HTML, DOM, JavaScript, network traffic and cookies. You should just use this tag in case the question is directly related to Firebug itself and not a website you are debugging with Firebug.

Firebug was a Firefox extension that allowed the debugging, editing, and monitoring of any website's , , , and . It also had a JavaScript console for logging errors and executing JavaScript as well as a network monitor, which measured the amount of time in milliseconds it took to execute scripts and load images on the page. And it included a way to check and edit the cookies a website sets. Furthermore it had many extensions, which enhanced its functionality.

It became a must have aid tool for developers and testers around the world, but has now been discontinued by its developers.

Firebug is free and open source, licensed under the BSD license.

Relation to Firebug Lite

While Firebug was a Firefox extension, there is also a JavaScript bookmarklet called Firebug Lite, which works in all current browsers. It is also available as Chrome plugin. More info about Firebug Lite is available at the 'firebug-lite' tag page.

When to ask a Firebug question

The 'firebug' tag should just be used if your question is directly related to Firebug itself. You should not use it if your question is about some issue within your page and you use Firebug to debug it.

Before you're asking a question related to the usage of Firebug you should read its FAQ and documentation. If you experience a bug within Firebug, you should follow the steps described at the first aid page.

Useful links

2729 questions
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How do I dump JavaScript vars in IE8?

I have an object I need to examine in IE8. I tried the developer tools and console.log, their Firebug equivalent. However, when I output the object to the log: console.log("Element: ", element); console.log(element); I only get the string LOG:…
Pekka
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8 answers

How to view WS/WSS Websocket request content using Firebug or other?

Is there a way to view the Websocket traffic? Only Websocket headers are visible on the initial handshake. Everything disappears after the response: Connection Upgrade Sec-WebSocket-Accept EQqklpK6bzlgAAOL2EFX/nx8bEI= Upgrade WebSocket I've…
Stevko
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10 answers

How to see the print media CSS in Firebug?

Firebug is an excellent tool to to show a screen media CSS for some HTML element, but is there a way to look at the print media CSS too? Or is there any other tool to see the print media CSS?
Janko Mivšek
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1 answer

Programmatically stop JavaScript execution in Firebug

I am currently debugging complex JavaScript code with Firebug. I am looking for a way to stop the JavaScript execution as if it was a breakpoint programmatically. Example: instructions ... degugger.breakpoint(); // the execution stops here as if a…
Nikko
69
votes
6 answers

How can I edit javascript in my browser like I can use Firebug to edit CSS/HTML?

Within JSP files, I have some pretty complicated Javascript. On a production machine, we're seeing a very weird bug that we have not been able to understand. We have never been able to replicate it in a local or development environment. It might…
Ryan
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14 answers

Is it possible to emulate orientation in a browser?

As the title is it possible to emulate orientation in google chrome or firefox? Meaning somehow change the browser to support media query (orientation = (landscape or portrait)) I have a emulator for mobile, but I would like to have the developer…
TryingToImprove
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67
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7 answers

How can I debug a minified JS in firebug?

I have a web page which includes insane amount of minified JS files. The web page works perfectly fine on my local network but throws some JS error on staging. There is an issue in JS and I wan't to debug it. When I load the JS in Firebug's script…
Kumar
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7 answers

Javascript that detects Firebug?

What's a surefire way of detecting whether a user has Firebug enabled?
Allan
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67
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6 answers

How to edit JavaScript in Firebug?

I am only able to view the JavaScript files of the website via the Script panel. How can I edit it? I tried everything like double clicking the line that i want to edit etc., but it doesn't let me edit it. If I move to the HTML tab, I am able to…
TCM
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4 answers

What is step into, step out and step over in Firebug?

I am new to FireBug Debugger can anyone say what is step into,step over and step out
akila
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Debugging Javascript on iPad

I was wondering if there are any useful tools people have found to debug javascript on an iPad which is not jail broken. It is an iPad supplied for work so jail breaking is not an option. Through some tedious steps I have gotten firebug-lite…
Jeff Fol
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firebug: how to cd to an iframe

I have a facebook canvas application that runs in an iframe. I would like to debug my page in firebug but can not get the javascript to scope to the iframe that is running my app. the iframe: