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Questions tagged [firefox-developer-tools]

For questions relating to the built-in developer tools in Firefox (Web Console, Debugger, Inspector, Style Editor, and other features similar to Firebug).

For questions relating to the built-in developer tools in Firefox (Web Console, Debugger, Inspector, Style Editor and other features similar to Firebug).

See also: https://developer.mozilla.org/en-US/docs/Tools

692 questions
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How to use debugger keyword in firefox dev tools?

Statement 'debugger' did not breaks execution of javascript code in latest firefox (29, 30, 31, 32) developer tools. How to stop execution from code like statement 'debugger;' do in chrome or in firebug?
Pavel Patrin
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What is causing the syntax error I see in Firefox developer console?

Attached is a screenshot of the developer console. I see a syntax error in a closure definition. I've a JavaScript file, which has the following function. I'm loading the JavaScript file from another function and calling sampleFunction() from…
Rupam Datta
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Font Inspector data from the DOM

Is it possible to get the Firefox developer tools Font Inspector data programmatically from the DOM? I.e., getting the used font from the DOM?
user1668240
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How can I trigger a jQuery event from developer tools easily?

I am developing a site that uses a ton of jQuery events. I need to be able to trigger some of these easily for testing purposes. Currently, I am continuously typing the following line into the console: $('body > #wrapper >…
Fizzix
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Where are the Web Console objects in Firefox Devtools?

I found a way to inject information into the Firefox Web Console, catching and modifying the return value of createMessageNode, modifying the web-console output: Oddly enough, the elements returned don't seem to have any possible way to link them…
NoBugs
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browsermob with selenium firefoxdriver issue

public class PerfTestt { public static void main(String[] args) throws Exception { ProxyServer server = new ProxyServer(8080); server.start(); Proxy proxy = server.seleniumProxy(); DesiredCapabilities capabilities = new…
Tester
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How can you change Firefox 25's Network Info Popups?

I noticed a change in Firefox 25 beta, soon to be released: Go to chrome://browser/content/devtools/webconsole.xul, view source, and in the current Firefox (24) you see:
NoBugs
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Strange getComputedStyle behavior

I was experimenting with this HTML comparison recently, which is somewhat working: /** * Compare 2 dom nodes * Given A node, identifier, B node, identifier, depth. */ function compare(A,Aid,B,Bid,godeep) { if (A.nodeName != B.nodeName) { …
NoBugs
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getElementsByClassName() not finding element in Firefox 25

In Firefox 24, Devtools-tweaks makes selected items in Firefox inspector outlined in darker blue, so they are more visible. In Firefox 25 beta, however, it says it's undefined when looking for the panel with 'iframe-ruleview' class (The right…
NoBugs
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Why doesn't XUL load handler work?

In Firefox dev tools, it seems the XUL iframes won't fire after the initial onload. For example, see the bottom of this file, where the extension makes the selected element in the inspector more easy to see. This is working when you open the…
NoBugs
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is there a way to run a script in developer tools that survives to page reloads?

is possible to run a script in chrome / firefox / msie's developer tools that survives to page loads/reloads? for example, I want to get a link URL in page A, load that URL B and get its page title, then I want to return back in page A, select…
user652649
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How to use visual paint feedback mode?

Firefox 22 introduces visual paint feedback mode. I haven't yet found a guide on how to fully utilize this feature. I see it change colors and flicker different colors when updating, but what do the different colors mean? How can we interpret the…
NoBugs
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Why use createElement instead of XUL description?

I was extending the css rule viewer in Firefox Devtools, and found something interesting: This is the content of chrome://browser/content/devtools/cssruleview.xul: …
NoBugs
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