Questions tagged [firefox-developer-tools]
The Firefox Developer Tools are the built-in development tools in Mozilla Firefox.
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Having a service worker installed hides server response delays
It looks like Firefox’s DevTools, both the Network tab and profiler, don’t show the server response time when there is a Service Worker involved. Everything is shown at 0ms. Is that expected and is ...
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How to save document directly from "network" tab in FireFox?
When we open a developer tool in Firefox, the "network" tab shows us resources that are loaded during the page load. If the resource is an image then there's a "Save Image As" menu ...
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Disable parentheses autocomplete on Leetcode
The in-browser Leetcode text editor autocompletes parentheses. (Typing '(' will automatically create a ')' in the text editor.) Unfortunately, Leetcode does not provide settings that disable this ...
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Loading a URL in the current tab through the Firefox “Browser Console” (or command-line)
For debugging purposes, I need to automatically load a large number of URLs (successively) in a given Firefox tab.
More precisely, my goal is to load URL1, URL2, etc., as if the user had typed these ...
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Using the Firefox Browser Toolbox and style sheets to hide UI elements
I am trying to hide the button circled in red prompting me to install a new search engine (which that one, brave, is already installed, so WTF?) However, I have no way to select it with the Browser ...
user1740026
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Removing "other bookmarks" from the Firefox bookmarks manager?
I don't know what this folder is for, and I don't know why Firefox forced this folder for everyone. But for me It is always empty because I never use it. I want to go a step further and permanently ...
user1740026
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720
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How to "inspect" the chrome of Firefox? [duplicate]
Surprisingly hard to google, thanks to the name of Google's own browser...
I'm making modifications to my userChrome.css file to move the findbar (ctrl-F) to the top right, to mimic what I'm used to ...
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How can I request a URL with ".." in it using Firefox?
I am building a personal website with flask. In order to test it, I want to request localhost/foo/../bar. However, when I navigate to this URL firefox automatically rewrites it and requests localhost/...
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Using Firefox's Network tab without the debugger halting the page?
I would like to use the Network tab to see what resources the page downloads while I'm interacting with it.
The problem is that, when I have the Network tab shown, if I then click any element on the ...
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How to make Firefox Findbar persistent? Solutions to my 2019-May posting no longer work
I'd like to make the Findbar in Firefox always visible; ie. I don't want to have to press Ctrl+F or do Main Menu > Edit > Find in This Page. (Sometimes the web page will override the keyboard ...
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How can I permanately disable firefox desktop notifications?
Notifications
I want to permanently disable these notifications that appear every time I take a screenshot using the built in screenshot tool and some add ons. The only settings related to this are to ...
user1740026
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How to "pause" a website on Firefox? [duplicate]
Here is my situation: I'm creating a custom CSS style sheet for the Duolingo website. I've changed the background colour for most elements, including the body. Now, when I click on a lesson in ...
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How to always open in Responsive Design Mode?
How to make Mozila Firefox always open Youtube site in Responsive Design Mode?
So that i don't have to always press Ctrl+Shift+M.
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no grid layout in firefox dev tools when in shadow root
When I have a CSS grid inside a shadow root,
Firefox dev tools doesn't show it in the layout grid pane.
It just says CSS Grid is not in use on this page
CSS Grids that are not inside a shadow root do ...
- 111
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Is it possible to copy CSS line number in Firefox?
It is really annoying to remember and type in line numbers of CSS rules, maybe there is some way to navigate quickly to the right line directly in my IDE? I can't believe nobody has an issue like this....
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How to edit a config in about:config via command line WITHOUT having to restart Firefox to have it applied?
I'm trying to automate a process and want to edit a config in about:config via command line WITHOUT having to restart Firefox to have it applied. How can I do that?
I'm under Linux. I tried editing ...
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Is it possible to search the developer toolbox on Firefox?
I can't find a way to search inside the developer toolbox (menu that appears when pressing CtrlAltShiftI).
Or is it not possible to search there at all?
I'm on Firefox v79 if that helps.
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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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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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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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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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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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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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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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802
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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 ...
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2k
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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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29
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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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863
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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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1k
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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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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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182
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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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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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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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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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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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400
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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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174
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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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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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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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309
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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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463
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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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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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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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254
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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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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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394
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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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698
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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 ...
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2k
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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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13k
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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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920
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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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