Join us to show up for other Firefox users 🦊. Earn fun badges and Mozilla swag vouchers! Find out more: https://mzl.la/askafox150

Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

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

Èròjà atẹ̀lélànà yii ni a ti fi pamọ́ fọ́jọ́ pípẹ́. Jọ̀wọ́ béèrè ìbéèrè titun bí o bá nílò ìrànwọ́.

Some websites, especially gmail won't show type properly

  • 1 èsì
  • 1 ní ìṣòro yìí
  • 11 views
  • Èsì tí ó kẹ́hìn lọ́wọ́ Happy112
  • Ti yanjú

In gmail all type is rendered as boxes with question marks in them. Have cleared cache and history, deleted cookies. Not having this problem with other browsers.

In gmail all type is rendered as boxes with question marks in them. Have cleared cache and history, deleted cookies. Not having this problem with other browsers.

Ọ̀nà àbáyọ tí a yàn

Hi  !

We've been getting a lot of these reports lately.

Would you try this :

Type in the address bar about:config (press Enter) Promise to be careful, if asked) Type and look for the preference : security.sandbox.content.level and set its value to 1 (one) (default value is 3 )

Close en restart Firefox.

Is everything back to normal now  ?

Note : This issue should be fixed when Firefox 57 is released - if it is : please change the value back to '3'

Ka ìdáhùn ni ìṣètò kíkà 👍 0

All Replies (1)

Ọ̀nà àbáyọ Tí a Yàn

Hi  !

We've been getting a lot of these reports lately.

Would you try this :

Type in the address bar about:config (press Enter) Promise to be careful, if asked) Type and look for the preference : security.sandbox.content.level and set its value to 1 (one) (default value is 3 )

Close en restart Firefox.

Is everything back to normal now  ?

Note : This issue should be fixed when Firefox 57 is released - if it is : please change the value back to '3'