This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Buscar en Ayuda

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

I am using Firefox 13 on my mac. When I go to youtube large ads appear on the left and right side and block the video. You can not close out the ads.

more options

Ads also appear in Facebook. The problem does not happen when I am using Safari. I have uninstalled and re-installed Firefox. I have never had this problem with Firefox.

Ads also appear in Facebook. The problem does not happen when I am using Safari. I have uninstalled and re-installed Firefox. I have never had this problem with Firefox.

Todas las respuestas (1)

more options

Might be caused by an add-on. Can you go through your list of add-ons and disable everything non-essential, then restart Firefox and check again.

Tools > Add-ons > Plugins
Tools > Add-ons > Extensions