Questions tagged [firefox-developer-tools]

The Firefox Developer Tools are the built-in development tools in Mozilla Firefox.

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9 views

Search / Find / Replace in Firefox Developer Tools Debugger

I've looked all over but I can't find anything (not even in the MDN Firefox Developer Tools Help Pages) which explains how, when I'm looking at the Debugger in Firefox Developer Tools I can request to ...
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20 views

How to download a website's source maps?

I don't want to write a complete script for this; there must be some simple way to download source maps. By this I mean go to a website (assuming it has source maps) in Firefox, open Developer Tools, ...
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18 views

Debug MSE and HTML5 videos in Firefox

In Chrome and Opera there is media-internals for getting detailed information on what's going on when a site is about to play a html5 video. How can I debug video sites in Firefox? (Beside of ...
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1answer
32 views

Meaning of the notification Firefox seems slow to start?

Hi Firefox experts, When launching Firefox, it sometimes displays at the bottom a notification saying "Mozilla Firefox seems slow... to... start." Is this an official notification type within ...
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1answer
17 views

how to use ctrl + 1 to switch to previous tab in firefox?

I'm using firefox 71 in mac os, i'd like to use ctrl+1 to switch to previous tab rather than command+shift+tab, how to achieve this? i tried an add-on called custom key but not working, i also tried ...
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21 views

How to find out which Firefox extension prints to console

One of the Firefox extensions I installed prints 'undefined' to the console. It happens in a file cs.js. Is there any way to find out which extension does that, apart from disabling them one by one?
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1answer
506 views

Intercepting input entered into the Firefox developer console?

I am currently in the process of moving my web-dev work from classic IDEs to the web browser console. The console is basically a JavaScript REPL, which is great, but that also means it can only ...
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1answer
68 views

Setting the text input value of the Firefox developer console?

I am currently in the process of moving my web-dev work from classic IDEs to the web browser console. This involves frequent editing of existing source code, which right now means... logging the ...
2
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1answer
172 views

How to turn off accessibility in Firefox?

I was turned on accessibility service on developer tool but I cannot turn if off. The turn off button said Accessibility service cannot be turned off. It is used outside Developer Tools. From ...
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1answer
14 views

Searching for CSS rule in all an element's children, not just selected elements

In the Firefox inspector's Inspector tab the CSS rules pane has a search tool but it only searches the element currently selected in the HTML pane. For example, I know there is a rogue width ...
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54 views

How to prevent the Firefox developer tools window from focusing on page reload?

I've been annoyed by Firefox developer tools window always restoring from minimized state (focusing) every time the page I'm working on is reloaded. I'm not sure if this is a quirk or a feature but ...
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157 views

Cannot remove breakpoints in Firefox debugger

I added some breakpoints in Firefox debugger and when I removed them, they just disappear in the Breakpoints list.Then, when I load the page, it still pauses at the breakpoints. If I close the ...
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1answer
551 views

How do I modify a variable at a breakpoint in Firefox Developer Edition?

I would like to be able to edit a variable after setting (and hitting) a breakpoint, in either Firefox or Firefox Developer Edition. It seems that it used to have this feature, but it was removed ...
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1answer
63 views

Can I use Firefox Dev tools in a seperate button on the task bar?

I'm on Windows 10 and am using Firefox Developer Edition. In Chrome, if I open the Dev Tools, I can undock the Dev Tools into a separate window. This creates a new task bar button specifically for the ...
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1answer
2k views

How to view log of network requests across tabs in Firefox?

Within Firefox, I would like to see all network requests being made by Firefox. Using Firefox developer tools works great for this. Just open the developer tools, click on Network, and there you go. ...
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1answer
4k views

How do I search with XPath in Firefox Quantum 65?

I used to use FirePath and FireBug for XPath support in Firefox a long time ago, but those tools haven't worked with Firefox for some time. I was disappointed but found that I could still use the find ...
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2answers
260 views

How can I turn on accessibility features in Firefox?

Firefox's developer tools has an Accessibility section that I'd like to use. However, the button to turn it on is disabled. I've tried refreshing the page once the Accessibility tab is open but it ...
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1answer
581 views

Unable to take full page screenshot using “screenshot --fullpage”

I am using Firefox 64.0 on Windows 10 (1803). In past I have been able to take full page screen captures by issuing the command screenshot --fullpage on the browser console. Now using this command ...
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1answer
95 views

How to manipulate DOM in ubuntu command line without actually rendering the page on the GUI?

I've written a small JS snippet which clicks some buttons in the DOM of a certain target website in a loop. To run this snippet, I open the target website in firefox. Then I paste this JS snippet in ...
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1answer
99 views

Turn visited website hyperlink to purple

By default any link I visit on google turns purple on most browsers. This only applies to the specific webpages I visit. Is there any way to turn links for all webpages of a particular website purple ...
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0answers
79 views

How to disable the blue lines in Firefox, when developer tools are ON

When we turn on dev tools in Firefox, especially the 'inspector', and we select some element, Firefox marks the element in the main view. This also happens, when we console.log(someHtmlElement) and ...
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2answers
835 views

How to change the width of the columns in Firefox’s developer tools’ network tab

In Chrome, I can customize the width of the columns in its developer tools’ network tab: In Firefox, I can’t figure out how to do the same thing: Is it possible?
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82 views

Debug video stream in Firefox dev tools

Is it possible to debug a video stream using the Firefox dev tools? Specifially I would like to monitor the transfer rate and find out why a video sometimes stutters. Not sure if it is caused by the ...
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0answers
281 views

Firefox Developer Tools failed to inspect variables on hover over

I have FireFox Quantum 57.0.2 (64 bits) and Windows 8.1. It was working fine till now, but suddenly I can't get pop up value on hover over variables. This and other issues come up in all pages ...
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1answer
44 views

Disable access to Firefox API in Console

I need to deploy Firefox and prevent users from doing Cu.import calls from the web console. Is this possible at all? If yes, is there a simple way to achieve this setting an about:config pref?
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1answer
140 views

Firefox devtools: how to hide console from other dev tabs?

When I open my Firefox 55 devtools (F12), the Console shows up under every tab. Here it's taking up the bottom 40% of the Network Monitor tab: This can be useful if I want to see new console messages ...
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1answer
55 views

Show all box models at once sticky [closed]

When I hover a DOM element in the Firefox Developer Tools, margins (yellow) and paddings (purple) are displayed on the website. Is it possible to show these boxes for all elements at once sticky?
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2answers
57 views

Change the site's source on each load in Firefox

There's a website on my uni localnet which serves an inline css for body <body class="maincon" style="somejunk"> making it look weird. Removing inline style with the Firefox Inspector (F12) ...
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234 views

DownThemAll - Wait page until finish loading then download

I'm using DownThemAll with Firefox. I've several links like this: site1.com/1.html site1.com/2.html site1.com/3.html etc.... I want to download these HTML pages with DownThemAll. The problem is: ...
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1answer
411 views

Inspecting elements on localhost doesn't display element dimensions

I'm using both "Regular" Firefox as well as the Developer edition. At the moment I'm developing a website locally (using node.js/gulp) and am experiencing a weird... maybe a bug? Whenever I inspect ...
3
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1answer
1k views

Firefox Developer Tools - Can't catch POST data

I'm trying to catch the POST requests made after logging into a website using Firefox Developer Tools, but as soon as the page loads and redirects me to the logged in page, all the entries in 'Network'...
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2answers
7k views

How to turn on Firefox's Responsive Design Mode's touch simulator?

I want to use Firefox for mobile development. And I would like to turn on Firefox's responsive design's touch simulator. While I'm in device mode in Chrome, the browser shows a gray circle as mouse ...
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1answer
574 views

How to get back the old debugger in Firefox

Firefox 52 introduces a new JavaScript Debugger with new UI but lack of many features that the old one has. One that I found critical and can't work without is the ability to search for some text in ...
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1answer
24 views

“Run to line feature” while debugging in Firefox

Is there a run-to-line feature in the default Firefox debugger? I use Firefox on Ubuntu. While debugging a block of code, I right-click on a line hoping to find some option to that effect, instead I ...
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101 views

Firefox developer cannot find chrome://ubufox/locale/ubufox.properties

I'm getting an error when I open my firefox developer edition browser in Windows 10, which is that it cannot find chrome://ubufox/locale/ubufox.properties. I suppose the reason is that I have ...
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1answer
482 views

How to disable the grid highlighting of multiple elements in Firefox?

Sorry, I don't know how to name that, tried to search looking for rulers, guides, grid and markup - no luck. I'm speaking about blue dashed lines and the gray area. Usually when you're at inspector ...
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3answers
586 views

Firefox: purge all data (cache, cookies, local storage, etc) for a specific website

Chrome has this handy tool: Lets you purge all kinds of storage for a specific website without ruining your experience for all other websites. How do I do the same in Firefox?
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1answer
39 views

Firefox web-console reference manual available?

In Firefox 46, I was looking for the options available for: The best I can get is this page. I'm actually interested in the full reference of the Firefox console. The best incomplete reference I ...
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1answer
28 views

Cycling though css values in Firefox's style editor

In Firebug, when editing some css property, I can press up and down to cycle through all the possible values. So if I'm editing the "color" property, and I press up/down, it will cycle through "red", ...
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169 views

Browser color distinction between production and dev environment

I use Firefox to develop and maintain a web application for my office. The interface will look identical for production & development, and the urls won't be easily distinct though except few ...
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0answers
82 views

How do I turn off groupLogMessages in Firefox console, not Firebug?

I know how to do this in Firbug, but want to disable the grouping (red circle with a number in it) in the regular console. I've searched inside about:config, but couldn't find it. Is this possible?
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415 views

Batch downloading from Inspect Element in Firefox? (DownThemAll doesn't work)

DownThemAll! shows none of these, but I can view all the images from Inspect Element. Is there a way to download all these images? Edit: I figured that I could use a batch descriptor: I could use ...
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1answer
76 views

How to set default size of page in firefox developer edition

I use Firefox Developer Edition on my Macbook pro retina. However, Firefox doesn't support finger pinch in and out page enlargement like safari and chrome. I have to do that from top bar. How can I ...
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1answer
310 views

Show autocomplete suggestions for Developer Toolbar in Firefox?

In the screenshot below (Firefox 39), the Developer Toolbar prompt (the one shown on Shift+F2, not the prompt of the (Web) Console raised with Ctrl-Shift-K, which is also shown above the Developer ...
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1answer
1k views

Firefox about:config reset

I've been troubleshooting my website and I changed a couple of settings in my firefox about:config. I changed the following settings, And now I get a ton of these errors on my site, These errors ...
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2answers
1k views

I am having trouble overriding Firefox default css using userContent.css file

I am using Ubuntu 14.10 with dark theme , Today I have upgraded my firefox to developer edition (40.x) previously i was on firefox 38.x I use some of the sites where firefox default from.css styling ...
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14 views

Firefox 10 developer console jumps down the screen when disconnected and the current webpage is interacted with, on Centos 6.3

If I disconnect the developer tools (via the position menu and select window), and press/hover over buttons or try to press the 'clear' button on the console, on Firefox 10, it jumps down the page. I ...
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1k views

Firefox 407 proxy authentication

I go through a proxy at work. I can access sites, however in the process firefox is reporting numerous 407 errors. I receive the following pattern for numerous resources per request, but not ALL ...
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1answer
144 views

How to narrow down the list of CSS properties in autocomplete of Firefox Developer Tools or Firebug?

We write CSS properties a lot. That's why autocomplete comes in handy. But it's a little frustrating when I press v hoping for vertical-align and it comes out vector-effect or d hoping for display and ...
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1answer
430 views

How to make Chrome show beginning and end of long URLs in the URL bar

I've been trying to find a Chrome extension that would show the beginning (www.domain.com/...) and ending (someFileorPage.html) part of a URL, in the omni-bar, truncating the middle part if the URL's ...