I'm a relative newbie to WebAssembly, but I've been working with it and Emscripten for about a month now, and have a decent familiarity with the minimal build kits. When it comes to debugging, I a...

I know that editing Javascript code in Chrome Developer Tools is possible - but I have not found a similar option in Firefox. Is there any way to edit the Javascript on a page in Firefox?

How is it possible to force a hard reload on Firefox for Android? On desktop it works with Ctrl + F5, but how does it work in the app?

In the below image, as you can see, there is a Sources tab that allows me to browse through my project files. Also, my Firefox DevTools do not show a Storage tab. I believe that is the tab tha...

I'm trying to find a way to use the developer tools in one of the Android browsers, e.g. Chrome and Firefox. They appear to not be shipped with the builds, to avoid cluttering them with functionali...

If I click on a filename with line number (script.js:100:4) in the Firefox developer tools, it takes me to an integrated editor. Is there a way to open an external editor (at the correct line) inst...

I am trying to add accessibility to a large web application built with react and webpack. This requires going back to the source files from the app. Is there a way to see which file the code origin...

I used (winter 2018) to be able to capture a JSON response using either Chrome or Firefox developer tools. Now for the long ones I need (>> 1 MB) Chrome doesn't work, and Firefox truncates at...

Webpages of forked GitHub repos display info such as "This branch is 10 commits behind". This used to be static HTML, but now that text appears with a delay. Specifically, a <span> ...

In Firefox DevTools there are auxiliary lines if I hover over any CSS: Are there settings in Google Chrome to get such auxiliary lines?

How to make the console of the Firefox DevTools multi-line? I am aware of the Shift+Enter keyboard shortcut, which makes the command line go to the next line. Though like in Firebug, I want to ve...

I would like to observe the contents of a POST request whose successful completion results in a location.reload() - when I try to capture this request in the Network Panel of the Firefox developer ...

I just want to get rid of all these OPTIONS requests:

How do I tell Firefox not to stop if it sees a debugger keyword? I need to avoid a continuous debugger loop in case the website uses debugging protection generating debugger statements on the fly ...

I keep getting errors from LastPass and some other extensions in the JS console (Firefox Devtools). Screen from one of those errors below. In my about:config extensions.logging.enabled is set to fa...

I don't think Firefox has any options to emulate a focused page to debug then what happens once a tab loses focus, like Chrome can do. Is there any way to fixate the focus state of a window in Fire...

Is there any way how to enable opening of devtools on all new tabs? I'd like to have devtools opened to be able to comfortably debug popup windows.

How can I reset a Firefox Web Console in order to be able to use variables already declared? console.clear() will only clear the output. All variables already declared are sticking in memory. I'm ...

How to capture webpage node screenshot with translucency? For example, capture the text rendering from a specific div with transparent background. "Node screenshot" feature of Chrome/Fire...

I am using <link rel="preload" ...> technique to make the resources load faster, but I'm not seeing a measurable effect on page load times. I'm not sure if this is because the resources are n...

I would like to be able to see the console and the debugger tabs of Firefox's developer tools at the same time. They should both be relating to the same page. How can I do this?

In my previous question: Securing javascript game timing ... it became clear that client-side timing in a Javascript/Canvas game simply won't be secure. I know the mantra about not trusting the cli...

how do i search for specific text in firefox devtools -> network -> response ? when i do ctrl+F nothing happens, and when i right-click, search isn't one of the options.. by comparison it's ...

For years I have been building apps with Vue-CLI which bundles Webpack. I see this prefix (protocol?) webpack:// but I don't actually know what it means. For instance, in the generated source map f...

The "paint flashing" tool in Firefox seems to have vanished. Both the docs and this answer are outdated. I'm running Firefox 96.0.2 (and Firefox Developer Edition 97.0b7) on a mac, and ne...