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How can I emulate media queries after Developer Toolbar has been removed?

The title says it all: After the Developer Toolbar has been removed in Firefox v62, how do I emulate media queries, like "print"? And how do I reset this setting? Just fo… (читать ещё)

The title says it all:

After the Developer Toolbar has been removed in Firefox v62, how do I emulate media queries, like "print"? And how do I reset this setting?

Just for your information in case your are in doubt about my question: While the Developer Toolbar was active, the Developer Toolbar command for setting media emulation to print was "media emulate print". The command for resetting the media type was "media reset".

Your answer is appreciated.

Asked by Alman 1 год назад

Last reply by Alman 1 год назад

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Are Firefox and Aptana divorced?

Hello. I have been trying to get the Firefox debugger to hook up with the Aptana editor. The instructions that I have are obsolete. The link http://firefox.aptana.com/upd… (читать ещё)

Hello. I have been trying to get the Firefox debugger to hook up with the Aptana editor. The instructions that I have are obsolete. The link http://firefox.aptana.com/update/ is supposed to automatically download the extension. It just takes me to a search engine results page full of links that barely touch on the subject. I also found out the Firebug has been deprecated.

Question: Are Firefox and Aptana divorced? Is there still a way to combine the Aptana editor to the Firefox debugger?

Asked by GailRoma 1 год назад

Last reply by Shadow110 1 год назад

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Page down causes developer tools popup: how to stop?

In FF 41.0.2, the developer tools inspector window pops up whenever I hit Page Down. How do I stop it? I've already toggled devtools.inspector.enabled to false but this… (читать ещё)

In FF 41.0.2, the developer tools inspector window pops up whenever I hit Page Down. How do I stop it? I've already toggled devtools.inspector.enabled to false but this has no effect.

Asked by unwendig 4 года назад

Answered by cor-el 4 года назад

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No element selected under Inspector

My Firefox Developer shows "no element selected" under Inspector after refreshing the browser for few times. Update on 8th September The issue always happen on Mobile Res… (читать ещё)

My Firefox Developer shows "no element selected" under Inspector after refreshing the browser for few times.

Update on 8th September

The issue always happen on Mobile Responsive Mode, I tried to uninstall all the extension but it does not help.


I don't think it is my computer issue because my office computer runs into the same problem as well.

Is this a bug?

I attached one image file for better understanding.

Thank you.

Asked by WeeHong 1 год назад

Last reply by WeeHong 1 год назад

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Screenshoot in responsive mode

If you use "Take a screenshoot" while debuging in responsive mode, the screenshoot ui tries to fit inside the responsive window. If you debugging a small device, the ui i… (читать ещё)

If you use "Take a screenshoot" while debuging in responsive mode, the screenshoot ui tries to fit inside the responsive window. If you debugging a small device, the ui is to large to fit.

Asked by puggan 1 год назад

Last reply by Shadow110 1 год назад

Open the payload of a HTTP error

I'm a software developer working on backend services, always juggling between Firefox and Chrome (because none of them fully satisfy my needs). What I need from them is t… (читать ещё)

I'm a software developer working on backend services, always juggling between Firefox and Chrome (because none of them fully satisfy my needs). What I need from them is to behave the way it will be most practical for me, which isn't necessarily aligned with the majority of users.

My current problem is this. I work with APIs which in my daily work often return various HTTP errors. These errors also contain a payload which describes the problem in detail. I want to be able to see this payload easily in the browser. Yes, I can use other tools like Postman for this (which I do), but for simple GET requests without special request headers it would be much more practical to just use a browser.

Currently, when my API opens an error (for example a 400 Bad Request), Firefox decides to just silently go back into the previous page (undos the URL change). If I open the Network tab in the Web Developer view, I can however see the failing response with all of its details. Still, this is too impractical for me.

BTW, the response contains a custom Content-Type which isn't recognized by Firefox by default. But Firefox isn't downloading the payload as a file (like it would usually do for a successful page load of an unknown Content-Type), it just silently doesn't do anything. I've installed an extension to handle my custom Content-Types (called "Open in Browser"), but since Firefox isn't attempting to open this one, I can't use it in this case.

So, how can I force Firefox to stay on that URL and show the response payload in the window? If not in vanilla Firefox, any plugins? I've already kind of spent too much time on this for my liking. :/

Asked by marko.vodanovic 1 месяц назад

Last reply by AKASH kUMAR 1 месяц назад

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How do I turn off developer console

When opening a new web page the developer console shows up on the bottom of the screen and the page is locked. I close the console and the page works just fine. It even… (читать ещё)

When opening a new web page the developer console shows up on the bottom of the screen and the page is locked. I close the console and the page works just fine. It even happens on the Mozilla site. How do I turn the console off.

Asked by captainbob1 5 лет назад

Last reply by cor-el 5 лет назад

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Firefox inspector - CSS rules suggestions/hints

I have a problem with the inspector in Firefox browser. After some time of use, in the "rules" tab, system don't want to show me CSS syntax suggestions. After switching t… (читать ещё)

I have a problem with the inspector in Firefox browser. After some time of use, in the "rules" tab, system don't want to show me CSS syntax suggestions. After switching the inspector off and on, everything returns back to normal, but ... again ... after a few moments, the system stops showing me syntax hints.

Asked by JaszczurX 4 года назад

Answered by JaszczurX 4 года назад

Network tab shows duplicate entries

When opening the network tab, some entries show up three times. When selecting one and pushing the down key on the keyboard, it doesn't navigate through the list. It navi… (читать ещё)

When opening the network tab, some entries show up three times. When selecting one and pushing the down key on the keyboard, it doesn't navigate through the list. It navigates like shown in the attached gif image.

Asked by Proxi 4 месяца назад

Last reply by TyDraniu 4 месяца назад

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dev tool icons missing

Please see the attached image. The icon on the dev tools is missing, especially on the "debugger" tab. Application Basics Name: Firefox Version: 65.0a1 Build ID: 201811… (читать ещё)

Please see the attached image.

The icon on the dev tools is missing, especially on the "debugger" tab.

Application Basics


Name: Firefox Version: 65.0a1 Build ID: 20181102100039 Update Channel: nightly User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:65.0) Gecko/20100101 Firefox/65.0 OS: Linux 4.18.16-300.fc29.x86_64 Multiprocess Windows: 1/1 (Enabled by default) Web Content Processes: 10/8 Enterprise Policies: Inactive Google Key: Found Mozilla Location Service Key: Found Safe Mode: false

Asked by zer09 1 год назад

Answered by cor-el 1 год назад

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On the box model the text indicating content, padding etc is white. It is completely illegible.

When you inspect a element and go to the box model and hover/click on the different regions of the box model it shows what region the color indicates, for example content… (читать ещё)

When you inspect a element and go to the box model and hover/click on the different regions of the box model it shows what region the color indicates, for example content, padding,border etc. In Firefox 37.0.1 the text which show the name of the region is White, it is completely illegible and impossible to read. Why would you make the text white? Please revert the change.

Asked by Saleemu 5 лет назад

Last reply by guigs 5 лет назад

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Variable scopes completly empty in firefox developers edition

When i set breakpoint in same script on both regular firefox and developers edition Firefox, i can access variables in debugger tab on regular Firefox. Developers edition… (читать ещё)

When i set breakpoint in same script on both regular firefox and developers edition Firefox, i can access variables in debugger tab on regular Firefox. Developers edition Firefox always shows "no variables to display".

How can i fix this?

Asked by adam8282828 4 года назад

Last reply by guigs 4 года назад

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How can I use Scratchpad to write to apache server's root?

I'm trying to use Firefox-Developer Edition (version 45.0a2) for full web-development on my server. So, I've tried using the "Scratchpad" editor, which is great with the… (читать ещё)

I'm trying to use Firefox-Developer Edition (version 45.0a2) for full web-development on my server. So, I've tried using the "Scratchpad" editor, which is great with the Vim keybindings, to write/edit an html file on my apache server's "root" directory. Unfortunately, every time I save the file the permissions are changed from "-rw-rw-rw-" to "-rw-------", resulting in a permission error.

The server is hosted on RedHat Linux, with the default umask of "0022".

The "root" directory permissions are "drwxrwsr-x. root apache ".

Is this an unusual way for web-development, using Firefox and its developer tools alone?

I could relax the permissions on the server, however, since the firefox browser is, technically, still connected to the public internet, is there a security concern in doing this? I can't seem to find helpful relevant information that's specific enough to this type of problem, so I'm asking here. Or maybe there's a way to change an option within Firefox to accomplish this?

Asked by ILMostro 4 года назад

Last reply by guigs 4 года назад

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https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf#w_what-is-the-startup-time-graph says " All” toggle - not there now

This page https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf#w_what-is-the-startup-time-graph says " Clicking on the “All” toggle s… (читать ещё)

This page https://support.mozilla.org/en-US/kb/firefox-health-report-understand-your-browser-perf#w_what-is-the-startup-time-graph

says 

" Clicking on the “All” toggle shows all the startup times for the day."

This all option doesn't seemt o be there anymore

Asked by DMC1 4 года назад

Last reply by FredMcD 4 года назад

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In Firefox 62.0, where can I type "restart" to restart my browser and preserve my open tabs?

https://developer.mozilla.org/en-US/docs/Tools/GCLI says the Developer Toolbar's functionality is inside the Console tab of Firefox Developer Tools. I cannot run restart … (читать ещё)

https://developer.mozilla.org/en-US/docs/Tools/GCLI says the Developer Toolbar's functionality is inside the Console tab of Firefox Developer Tools. I cannot run restart to restart my browser from that tab. Where can I do it?

Asked by DiMono 1 год назад

Last reply by cor-el 1 год назад

How to disable flashing in the inspector?

When an element updates it flashes yellow in the inspector. Is there a way to disable this? I am working on a web game and elements get updated all the time and the yello… (читать ещё)

When an element updates it flashes yellow in the inspector. Is there a way to disable this? I am working on a web game and elements get updated all the time and the yellow flash every second gets really annoying, making it harder to debug.

Asked by Donutask 2 месяца назад