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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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Firefox for Android: can't modify anything on about:config

TLDR: firefox for android does not show expected about:config screen. Firefox: 39.0 Phone: Nexus 5 I am trying to install and configure an extension on firefox for Android. I've been following these instructions, which work fine until I have to…
sapo_cosmico
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issue accessing the contentScript file when the tab url belongs to the file system

the following is a fragment of the "main.js" code. My problem is that when I use the "option 1" url the code works perfectly but when I use the "option 2" url, then the functions marked to be exported on "content-script.js" (to be seen on…
nightclub
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Need to delete particular cookie from Firefox addon

I need to delete an already set cookie. Need not to set a cookie from firefox addon. Just locate a cookie and delete that from the addon code and then fire the api is the requirement.API call has been successfully made.I only need code to delete a…
Arora S
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i have developed website and the issue is that same version of firefox shows different design on different computers while other browsers were fine?

i have developed this website http://www.falestinona.com/nashra the website tests on my laptop are correct and same design over IE, Chrome, FF and Opera the problem i have found that same version of firefox shows the design different on different…
Final Heaven
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Graphics-debugging for html5 video?

Recently I noticed a certain looping full-screen video tag breaking on one computer - A Win8 system that apparently has problems with older drivers for the amd/nvidia graphics. The odd thing is, I would usually get an error (with videoelement.error)…
NoBugs
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Profiler shows high cpu load in graphics, shows multiple sites?

Why does the Firefox Profiler show javascript from every tab? When profiling my own setup I saw a log of mostly graphics (green), mostly highlighted when I select a script from plus.google.com, and talkgadget.google.com, translate.google.com. I also…
NoBugs
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Firefox Network Monitor Request Size

Firefox Network Monitor lists a column for the size of a request, but it does not specify if it's the total size of outbound and inbound traffic, or just the outbound. Is there another way to measure a request's outbound traffic size (POST data +…
boobsbr
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Can't find images associated with Mozilla Ghostwriter demo

I have kind of a weird question. I want to get the following demo up and running, then modify it: https://developer.mozilla.org/en-US/demos/detail/ghostwriter-art-studio/launch However, the source code is apparently outdated. So I went back to the…
user2469520
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Debugger doesn't show frame html source

I'm using Firefox developer edition, trying to debug a page (html+javascript) in a frame. With Firefox 33, in the debugger section I can see the source code of the page inside the frame, activate breakpoints... My problem with developer edition is…
jlgetxo
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Is there a way to see helpful information regarding event listeners in chrome/firefox developer tools?

Since I am binding to a click event with jQuery, it is really hard to figure out where that code is in my application. The event listeners panel in chrome looks like this: However, when clicking on the definition, I am taken to jquery. There is no…
Vlad Nicula
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Why does xul overlay create 2 ids, instead of combining?

I'm seeing this in the browser toolbox: I would think it would combine my overlay with the same id - why does it create two with the same ID?
NoBugs
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How to deal with changing JavaScript files for debugging?

The Reason : I have a complex web application that consists of many iframes on a single page. It was designed this way so that the pages in the iframes could be debugged and reloaded without reloading the whole page. Unfortunately since the JSD2…
Mahks
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How to develop Firefox addon that adds tab to firefox native developer tools (not firebug)

I am trying to create addon for firefox that will add some functionality to firefox developer tools. similar to Ember inspector (https://addons.mozilla.org/en-US/firefox/addon/ember-inspector/) Is there any good tutorial or sample of code that will…
Tornike
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How to access firefox functionality with an add-on for which no api exists

How does one access parts of firefox with an add-on, if no suitable api exists? Specifically I would like to read and modify the content of the list of past downloads.
ARF
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Why was the 3d Button in Firefox 30.0 removed?

Does anyone know why the 3D view Button in the top of the developer tools is gone? Is there a way to re-activate it or was it removed permanetly?
superschaf
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