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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
182
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5 answers

Can I prevent the Firefox developer tools network panel from clearing on page reload?

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 tools, I find that the page reload clears the list…
jl6
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117
votes
11 answers

Increase code font size in firefox developer tool

How to increase code fonts in Firefox developer tools? I know that there is a zoom function but I want to set the font size only for the code.
LDMdev
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105
votes
1 answer

How to identify who initiated the http request in Firefox?

I am developing a new Firefox addon that intercept all Firefox's network traffic (http(s) requests with http-on-modify-request) With my current code, I am able to separate requests coming from web-pages/tabs and all the other components (RSS feed…
intika
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100
votes
8 answers

What unique features does Firebug have that are not built-in to Firefox?

I just cleaned my Firefox addons and wondered: Which features does Firebug have that make it unique? Which features are available in both Firebug and the Firefox Developer Tools?
janpio
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89
votes
5 answers

What does "Blocked" really mean in the Firefox developer tools Network monitoring?

The timing section of the Firefox Network Monitor documentation, "Blocked" is explained as: Time spent in a queue waiting for a network connection. The browser imposes a limit on the number of simultaneous connections that can be made to a single…
Yves Dorfsman
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57
votes
2 answers

Firefox developer tools truncates long network response, Chrome does not show

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 1 megabyte. This was using the developer tools. Short…
Doug McDonald
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56
votes
2 answers

What to do about "The Components object is deprecated. It will soon be removed." in dev tools Console

For almost every page I open in Firefox, I see this error in the Console of the developer tool bar: (!) The Components object is deprecated. It will soon be removed. The source is the html page. It happens with pages I create, but also on many…
R. Schreurs
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43
votes
3 answers

How to force Firefox to open devtools on each tab?

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.
czerny
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40
votes
5 answers

How do I disable firefox console from grouping duplicate output?

Anyone knows how to avoid firefox console to group log entries? I have seen how to do it with firebug https://superuser.com/questions/645691/does-firebug-not-always-duplicate-repeated-identical-console-logs/646009#646009 but I haven't found any…
amicoderozer
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38
votes
3 answers

How to edit or remove cookies in Firefox DevTools?

In Firebug I am able to remove and edit any cookies using the Cookies panel. But in the Firefox DevTools I can't find any way to remove or edit cookies. Where can I do that?
LHA
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35
votes
2 answers

Change columns size in Firefox Developer Tools

Is it possible to change columns width in Firefox Developer Tools? How can I do it? When I point over column edge (like Status, etc. on the screenshot) there's no resize tool so I can see whole content.
Daniel Gadawski
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35
votes
6 answers

How to do a simple search in Firefox DevTools' Inspector tab?

I'm using the Firefox DevTools and I'm using the Inspector tab, in which it displays the HTML tree. When I use the Search HTML feature, it only searches tags. So suppose I have this:
textinsidediv
And when I search for 'div',…
pillarOfLight
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33
votes
1 answer

How to programmatically replicate a request found in Chrome Developer Tools?

I'm looking at my balance on Venmo.com but they only show you 3 months at a time and I'd like to get my entire transaction history. Looking at the Chrome Developer Tools, under the network tab, I can see the request to…
Chet
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31
votes
3 answers

How to remove event listeners in Firefox debugger?

Firefox has a feature in debugger that lists events for nodes - here's a help article for it. For unclear reasons, I can't find a way to remove any of those listeners. How do I do that?
Tomáš Zato
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31
votes
1 answer

How can you disable the new JSON Viewer/Reader in Firefox Developer Edition?

Firefox Developer Edition 44 now has a built in JSON Viewer. It's a nice gesture, but I highly prefer the readability of the third-party JSON viewer I was using. Is there any way to disable, override, or otherwise customize the new built in JSON…
flybayer
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