Many site issues can be caused by corrupt cookies or cache. In order to try to fix these problems, the first step is to clear both cookies and the cache. Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

Did this fix your problems? Please report back to us!

en español please

Sorry, I don't know español, i'm learning

Utilice Transaltor Google

• http://translate.google.com/#en/es/Use%20Google%20Transaltor

todo eso de borrar cache,coockies, historiales y demas no funciona tampoco, este problema ya lleva varios meses y sin solucion.-

es un desastre el soporte q ofrece firefox a sus usuarios.-

implantan una version nueva y ni comprueban los fallos q ofrecen y lo q es peor no hacen nada por solucionarlo.-

habra q pensar en dejar de usar firefox y buscar otro, por lo menos dejan ganar a nuestra costa.-

Firefox should be using the Silverlight to attach files.

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

• Do NOT click the Reset button on the Safe mode start window or otherwise make changes.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes