Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

How do I enable Javascript in Firefox 24.0? It suddenly became disabled.

  • 2 replies
  • 69 have this problem
  • 20 views
  • Last reply by Emalee

more options

Suddenly, I was unable to access Hotmail or another email account that uses Outlook. The message I received was: "JavaScript required to sign in. This web browser either does not support JavaScript, or scripts are being blocked."

1. Why would this spontaneously happen?

2. How do I fix it?

Suddenly, I was unable to access Hotmail or another email account that uses Outlook. The message I received was: "JavaScript required to sign in. This web browser either does not support JavaScript, or scripts are being blocked." 1. Why would this spontaneously happen? 2. How do I fix it?

Chosen solution

You can check the javascript.enabled pref on the about:config page.

There are also extensions that can block JavaScript or otherwise interfere.


You can try some basic steps in case of issues with web pages:

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • Hold down the Shift key and left-click the Reload button
  • Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • Press "Command + Shift + R" (Mac)

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

  • Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox > Preferences > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window.
Read this answer in context 👍 12

All Replies (2)

more options

Chosen Solution

You can check the javascript.enabled pref on the about:config page.

There are also extensions that can block JavaScript or otherwise interfere.


You can try some basic steps in case of issues with web pages:

Reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • Hold down the Shift key and left-click the Reload button
  • Press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • Press "Command + Shift + R" (Mac)

Clear the cache and cookies only from websites that cause problems.

"Clear the Cache":

  • Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox > Preferences > Privacy > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

  • Do NOT click the Reset button on the Safe Mode start window.
more options

The about:config solution worked! Thank you very much.