Hi Camilla1997,

I'm afraid this forum is only for the English language, can you post again your question in English maybe we can help?

Thanks!

Clear the cache and the cookies from sites that cause problems.

"Clear the Cache":

• Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"

"Remove Cookies" from sites causing problems:

• Tools > Options > Privacy > Cookies: "Show Cookies"

See also:

• https://support.mozilla.org/kb/Problems+using+Facebook+in+Firefox
• https://support.mozilla.org/kb/fixing-facebook-or-youtube-problems