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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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Can't register style to dev-tools

I created a test extension, to change a few things and maybe add some features to Firefox built-in devtools. I set up a basic extension, with content css and the usual files, and chrome.manifest: content devtooltweaks content/ style…
NoBugs
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Script To Tick all Boxes using Chrome

I am using the script below to tick all checkboxes on chrome (Dev Console), within the exception to not selec few boxes. It does work on chrome and tick the boxes I needed, but when I hit submit nothing happens because its mandatory to select the…
Draven85
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Where is the Network Preview Tab in Firefox

Does Firefox Developer have a Preview response tab under Network monitoring like Chrome? (screenshot below): Here is a screenshot of Firefox Developer, I don't see the equivalent tab. I read through the Firefox documentation on Network monitor…
Seraph
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Getting Unsafe URL error when trying to send POST request from Firefox console

When I try to send a POST request, I am getting Unsafe URL error. How can I solve this problem? What could be the problem?
Emre Karatopuk
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Firefox DevTools don't allow to inspect an element

Here is an example page: https://www.lazada.vn/products/dam-xoe-so-mi-vien-den-han-quoc-dx30-trang-i145861801-s151858737.html When I right-click the main product image on this page and choose "Inspect Element from the context menu, the DevTools…
Alex Sharov
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Firefox 51.0.x Developer Tools Opens with every new site

The new Firefox dev tools (replacement for Firebug) console opens each time I access a new web url. It's a real pain. Is this happening to others? I've tried a clean install and full reset of Firefox and it still happens.
Bob Rast
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Is "Window.showModalDialog();" deprecated in new version of firefox (**51.0.1**) ? . This is recent release

I'm experencing following issues while using modal dialogue from Javascript
NNR
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Automate / trigger console command in firebug

In firebug I want to automate running a console command like this: holder += ($p).innerHTML + '\n'; copy(holder) ..to run each time a page element (selected and stored in $p) loads new HTML. I'm using Firebug and there in HTML tab we can…
Nikhil VJ
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Angular JS - How to find the element in DOM having the xpath?

How can I use xpath instead of id to find the element in DOM. I know that for id I can use: $("#id")[0]. I use $("#id")[0] inside Developer mode in browser in order to get the element by id to see what methods (like .getText(), innerHTML or others)…
AndreeaFed
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Firefox DevTools :hover state disappears

Trying to move from developing on Chrome to Firefox Dev Edition, and when I am in the Firefox DevTools, I'm triggering the hover state on an element but the state disappears as soon as I click any other element. This is not happening in the Chrome…
Alex Leibovich
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How to save content from Mozilla developer network (javascript guide) for offline viewing?

The links provided by MDN on its website gives me older version of the guide which is not well organized. The guide i want to download is this one. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide
Midnight
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How to remove Developer tools changes redundancy

Is there a way to hide the red text or changes in developer tools? I tried everything I know but it still there. how to remove the red padding-tops
Kevin Webster Revalde
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Dev Tool clearly showing json response but not on browser / postman / python request etc

please mark this question as dumb if you should, because i really feel dumb . i check this link https://www.instaforex.com/specifications/currencies?account=standard&instrument=currencies&page=1, on Dev Tool it clearly show giving json response.…
hafidzaini
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Why is `unreachable code after return statement` warning shown twice in console? (Firefox 72.0.2,Win 10)

I'm running Firefox 72.0.2 on Win 10. This is more a question of how to use the inbuild debugger or developer tools properly. When loading test.html the console shows the unreachable code after return statement warning twice now. The return is in a…
Bill
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Which syntax highlighter does Firefox Quantum Dev Tools use?

Does anyone know what kind of syntax highlighter (and what theme, if it has any) does Firefox Quantum (v57+) use in it's Inspector panel of their developer tools? I believe it was introduced with their new Photon UI, but I'm not sure whether it's…
Slava
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