alert() and console.log() not working in Firefox 26

Question

I feel like I'm going crazy but alert() and console.log() refuses to work anywhere on Firefox 26.

At first I thought it was my own website's problem, but I cannot for the life of me to get it to work via javascript: urls, Firebug, I even tried it in jsfiddle.net by just putting alert('test'); in the script panel.

Tried uninstalling and installing again, no luck.

The only extension I'm running is Firebug.

Heck, Stackoverflow didn't even prompt me about leaving when I accidentally clicked the back button while writing this.

Also yes, I made sure there was some content inside the alert() and console.log()

What I mean by not working is that Firefox treats the code as if it were non-existent, nothing happens.

Once again, here's my environment:
Browser: Firefox 26.0
OS: Windows 8.1 Pro
Issue: alert(), console.log(), and apparently prompt() doesn't work

If anyone might know why this is happening, I would highly appreciate an answer.

UPDATE

Following Pointy's comment, it appears that both alert() and console.log() work as expected on the New Tab Page, but nowhere else

@pdoherty926 yes I'm 99.99% sure JavaScript is enabled. All other javascript works as expected (e.g. Google Instant Search) — Kevin Pei, Dec 28 '13 at 03:53
It may be your firefox version and firbug version is not suitable each — suresh gopal, Dec 28 '13 at 03:59
@JayBhatt suresh.g following FroggyDay's answer, I uninstalled firebug too and now I have absolutely 0 extensions, still not working though — Kevin Pei, Dec 28 '13 at 03:59
So if you open a new tab, bring up the developer console, and type "alert('hello world')", nothing happens? — Pointy, Dec 28 '13 at 04:02
@Pointy wait actually it does. **Only** on the `New Tab Page`. Nowhere else. — Kevin Pei, Dec 28 '13 at 04:05
@KevinPei so, like, here on the Stackoverflow page, it also doesn't work? — Pointy, Dec 28 '13 at 04:07
Sorry for bad question but i have to ask how you are checking alert?That may be cause problem — Just code, Dec 28 '13 at 04:10
@dholakiyaankit anyway I can. Via the console, jsfiddle, and my own test webpage. For example, http://jsfiddle.net/b38p6/1/ doesn't alert anything for me. — Kevin Pei, Dec 28 '13 at 04:11
@dholakiyaankit like I said above, I have absolutely no addons or extensions enabled at this moment — Kevin Pei, Dec 28 '13 at 04:21
what and how are you trying to console, could you please show me your relevant code? — Prasanth K C, Dec 28 '13 at 04:22

score 3 · Answer 1 · edited May 23 '17 at 12:19

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You might want to try re-installing Firebug:

console.log in firefox is not working?

PS: I happen to be running a similar configuration (including FF 26) ... and things work fine for me. IMHO...

PPS: You might also try setting "about:config, prompts.tab_modal.enabled = false":

https://bugzilla.mozilla.org/show_bug.cgi?id=613752

The default is "true", my FF 26 is set "true" and things are working for me ... but who knows. If reinstalling Firebug doesn't help, maybe it's worth a shot?

edited May 23 '17 at 12:19

Community

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answered Dec 28 '13 at 03:53

FoggyDay

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Thanks for the answer, but sadly it seems that Firebug is not the problem. I completely uninstalled it and restarted firefox and it's still not working – Kevin Pei Dec 28 '13 at 03:55
@FroggyDay thanks I also tried setting it to false, still not working – Kevin Pei Dec 28 '13 at 04:00
One additional suggestion: see if you can reproduce the problem with a small, self-contained example. Include the complete HTML, not just the Javascript snippet. Who knows: maybe there's an issue with *where* you're calling the alert; or something occurring before the alert gets invoked? – FoggyDay Dec 28 '13 at 04:04

score 3 · Answer 2 · answered Dec 28 '13 at 09:57

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Silly but, in firebug can you check if window.alert and window.console are defined.... and if yes then, can you check if window.alert('hi') works ?

answered Dec 28 '13 at 09:57

Bhaskar Melkani

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score 3 · Accepted Answer · answered Dec 29 '13 at 03:42

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Thanks for all the help guys, in the end I used Revo Uninstaller to completely and absolutely wipe Firefox from my system, then installed it again. Seems to be working now, the original uninstaller most likely didn't remove whatever was causing the problem.

answered Dec 29 '13 at 03:42

Kevin Pei

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I've had the same issue with firefox 27.0 on mac. – user1255933 Feb 07 '14 at 02:11

score 0 · Answer 4 · answered May 06 '14 at 15:50

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I have same bug when i using Ghostery extension. Disable Ghostery and reload page. Lets check at https://getfirebug.com/tests/head/console/api/log.html

answered May 06 '14 at 15:50

evgenius

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score 0 · Answer 5 · answered Aug 06 '14 at 07:11

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I had a similar issue, on IE v11.0.10 and Chrome Canary v38.0.2114. Duplicate function name turnout to be the issue. Worth doing a quick check for function names in Javascript file.

answered Aug 06 '14 at 07:11

Dumindu Lathpandura

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score 0 · Answer 6 · answered Sep 02 '14 at 17:31

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You can use the Firefox console with CTRL + SHIFT + K

Related: https://support.mozilla.org/en-US/questions/876916

answered Sep 02 '14 at 17:31

Chip McCormick

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alert() and console.log() not working in Firefox 26

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