In Firefox, console.log is not showing anything

Question

I'm trying a simple console.log function in Firefox:

console.log("Hello, World!");

You may try it on: http://jsfiddle.net/EkZjK/

You may also try the full code in a stand-alone HTML file:

<html>
    <head>
        <meta content="text/html;charset=utf-8" http-equiv="Content-Type">
        <script type="text/javascript">
            console.log("Hello World !");
        </script>
    </head>
</html>

I get console logs in Chrome. But in Firefox I cannot see the logs.

I tried the Firebug console and Ctrl + Shift + J. Both don't show the log message in Firefox.

PS: I restarted Firefox, restarted Windows, tried on another machine, deleted the Firefox profile and created another one, and reinstalled Firefox. But the problem still exists.

How can I solve this?

@Asraf Bashir: Restart Firefox then try Restarting Windows itself. So you are still not sure whether you got a log in chrome ? Did you open the console first and then load the page or how did you do it exactly? — karthick, Mar 26 '13 at 09:28
Yes, I open the console first then load the page. I tried windows restarting, ff restarting. I even tried on another machine. Could you please try it yourself by running the jsfiddle above in you FF ? — Ashraf Bashir, Mar 26 '13 at 09:46

score 121 · Answer 1 · edited Oct 20 '20 at 16:32

121

For some previous versions of Firefox

I had the same problem with a different root cause.

Hit Ctrl + Shift + K to open the full console. In the second row from the top there are tabs - Net, CSS, JS, Security, Logging, and Server. Hit the triangle to the right of "Logging" to open the dropdown and make sure that at least "log" is on.

edited Oct 20 '20 at 16:32

Peter Mortensen

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answered Apr 04 '15 at 04:57

0fnt

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omg, what was the other console if this one is the right one? – eyn Oct 10 '17 at 23:44
This is the real answer to the question! – Merin Nakarmi Jan 15 '18 at 00:19
Why did you write K and not J? – Nubcake Mar 27 '18 at 21:45
1

Current versions of Firefox (e.g. 81.0.2) have *"Errors"*, *"Warnings"*, *"Logs"*, *"Info"*, *"Debug"*, *"CSS"*, *"XHR"*, and *"Requests"*. Where is the drop down? The settings dropdown has *"Show Content Messages"*, *"Show Timestamps"*, *"Group Similar Messages"*, *"Enable Autocompletion"*, and *"Instant Evaluation"*. Can you update your answer? – Peter Mortensen Oct 20 '20 at 15:50
1

The corresponding setting in newer versions of Firefox might be *"Show Content Messages"* in the settings dropdown to the right (next to *"Requests"*). – Peter Mortensen Oct 20 '20 at 16:39
I'm using Chromium and Firefox 81.0.2 with the same effect. console.log() output appears in Chromium, but not in Firefox and there is no "Show Content Messages" option in the console drop-down, and I have all the options enabled "Errors", "Warnings" etc. I'm on Ubuntu 20.10. – happybeing Oct 29 '20 at 12:21
Strange: I went back to test FF in a new window and now it works. I wonder if it was broken by an error in my script, but stays broken after I fixed it. – happybeing Oct 29 '20 at 12:26

score 25 · Accepted Answer · edited Oct 20 '20 at 14:25

25

Reinstalling the Firebug plugin solved the issue. Now it appears in the Firebug console (not in Ctrl + Shift + J).

edited Oct 20 '20 at 14:25

Peter Mortensen

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answered Mar 26 '13 at 10:16

Ashraf Bashir

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5

console.log never appears in the "ctrl+shift+j" console. Try "ctrl+shift+k". – Boris Zbarsky Mar 27 '13 at 03:51

score 11 · Answer 3 · edited Oct 20 '20 at 16:36

11

For Firefox 77.0.1 and Ubuntu 18.04 (Bionic Beaver) LTS (Bionic Beaver):

I had the same problem.

Open the Firefox console - Ctrl + Shift + J.

In the browser console, click on the top right settings icon. In the dropdown, click on Show Content Messages.

Then console.log messages will start showing up in the console.

edited Oct 20 '20 at 16:36

Peter Mortensen

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answered Jun 15 '20 at 05:02

Aseem

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I owe you a beer or whatever drinks you like ! :) Thanks for it ! – Tyteck Oct 22 '20 at 20:45
blue label on rocks please – Aseem Oct 22 '20 at 20:59
1

Dear FF, Please don't hide the tried and true debugging method. Yes, there are better ways, but at least give us some kind of hint that you're eating console logs. – joshfindit Sep 04 '21 at 05:29

score 3 · Answer 4 · edited Oct 20 '20 at 16:14

3

Uninstall Firebug (or disable it)
Press F12 and enjoy the console.

The problem is Firebug. It's not maintained anymore and may be unstable (see the official page). Other users here recommend to update it, but it may not work, or work until the next Firefox update.

edited Oct 20 '20 at 16:14

Peter Mortensen

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answered Jul 24 '17 at 12:30

fresko

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I don't have Firebug *at all* and the Firefox console is telling me that "console.log" is undefined. – dauber Jul 25 '17 at 15:16

score 3 · Answer 5 · edited Oct 20 '20 at 16:21

3

I had this problem in Firefox 71, and I found that when you open the console not everything is automatically logged.

When you go to the right side of the console you see a number of buttons, (Errors, Warnings, Logs, Info, Debug, CSS, XHR, and Requests). Enable all logs by clicking these buttons.

edited Oct 20 '20 at 16:21

Peter Mortensen

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answered Dec 30 '19 at 15:11

Freeze

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score 3 · Answer 6 · edited Oct 20 '20 at 16:24

3

I had the same problem with Firefox 75.0 on Ubuntu 18.0 (Bionic Beaver). The following solved it for me:

Open the Console
Click the Logs button until grey in Filter output row on the right
Click the Settings gear on the right and choose in the dropdown "Persist Logs".

edited Oct 20 '20 at 16:24

Peter Mortensen

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answered Apr 10 '20 at 19:17

Hmerman6006

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score 2 · Answer 7 · edited Oct 20 '20 at 16:15

2

I had the problem again today with Chrome and Firefox. Ultimately, however, the cause was not the console, but some code in jQuery UI v1.12.1.

After I had written console.clear() after the jQuery UI code, the console outputs after this script were shown again.

edited Oct 20 '20 at 16:15

Peter Mortensen

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answered Apr 17 '18 at 07:52

score 2 · Answer 8 · edited Oct 20 '20 at 16:35

2

I recently had the same issue with Firefox. What worked for me was restarting Firefox and then adding the Console.clear() method to my script. Once the page loads up, the console logs your messages again.

edited Oct 20 '20 at 16:35

Peter Mortensen

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answered Oct 14 '20 at 06:26

Viceodev

31
5

score 0 · Answer 9 · answered Jul 14 '21 at 19:05

0

In FireFox 90.0, Mac OS 11.4, I had to click on the Gear Icon and put a check mark next to 'Show Content Messages' before console.log output appeared on the console.

Edit: I see now this was mentioned in the fine print on one of the responses above.

answered Jul 14 '21 at 19:05

TundraGreen

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score 0 · Answer 10 · edited Oct 28 '21 at 03:59

0

I had the same problem with my browser but all you’ll have to do is to open up the console by pressing ctrl + shift + k or press the right key and press inspect then navigate to the left hand section that says logs click on it and you should be good to go

edited Oct 28 '21 at 03:59

MD. RAKIB HASAN

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answered Oct 26 '21 at 14:52

Travon

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In Firefox, console.log is not showing anything

10 Answers10

For some previous versions of Firefox

Linked

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