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 Both the docs and this answer are outdated.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...

I am measuring the performance from a website. When looking at the firefox-developer-tools, I noticed a weird behavior. There is a specific JS file which the transferred size is 2,831.54 KB, but th...

As you can see here, the Developer Toolbar has been removed from the latest versions of Firefox, so I can't run a "media emulate print" command anymore. I would prefer to not have to use Chrome to ...

I am running FDE 59.0b12 on Windows 10 64-bit; I am trying to follow the procedure/video shown at URL: https://developer.mozilla.org/en-US/docs/Tools/Debugger/How_to/Set_a_breakpoint in order to de...

I have a problem to make Firefox Developer Tools (Firefox Developer Edition 59.0b7) work with CSS source maps generated by Webpack in development mode (using webpack-dev-server). In Firefox Develo...

I can't find a way to search a string in all .js and .css files on Firefox Developer Edition 56.0b4. I found a way, but it was before versions 52. I wonder why they removed this feature? Thanks f...

I can only see the .js files, the .ts sources don't appear in Firefox. It works in Chrome, I can see and place line breaks in .ts files, and the debugger works great. But Firefox will not work, no...

Ok, I created a basic Angular 2 Typescript project using 5 Min QUICKSTART and it's up and running. My typescript transpiller is configured to create source map: tsconfig.js { "compilerOptions"...

Take a look at the below code: var c = 50; { console.log(y); let y = 50; } This code is expected to throw a ReferenceError and it does. But in the console, the message attached with the excep...

I'm experiencing the behaviour of breakpoints moving to the end of the file in Firefox Developer Edition when trying to set them anywhere in the javascript. Sometimes after restarting the PC or ...

I switched from Google Chrome to Firefox Developer's Edition because of memory leak issues and moving towards truly open-source solution. I want to debug the payload of my request which is JSON bu...

Just as title says, I'd like to know if it's possible to change the color theme of Firefox Developer dev tools. Light and dark theme are nice, but I'd like to use a code color theme like Monokai or...

I'm using FirefoxDeveloperEdition 36 on OSX 10.10.1. I've enabled the "Disable Cache (when toolbox is open)" option in the toolbox's settings panel: However, I'm not seeing my changes until I ma...

I am using Firefox Developer Edition and when I had the Inspector open, which is accessed by right-clicking an item and selecting Inspect Element, I then right clicked something in the Inspector an...

I check disable cache when dev tools is open but my firefox still caching some javascript. Cmd + Shift + R doesn't affect this behavior. Some files like font are cleared but javascript files seems ...