Did you experience problems with Firefox 4 beta and cookies? A possible cause is that in Firefox 4 beta, the cookie limit is now per-domain instead of per-host, so any single domain can now, by default, keep up to 50 cookies. For some Web applications. that might be set too low. When the limit is hit, Firefox will start “randomly” deleting cookies, which can cause problems, typically with Web applications that use cookies for Single Sign-on and login credentials.
The solution is to browse to about:config, and add (or modify it if already exists) an integer preference named network.cookie.maxPerHost. Set it to 500 or somesuch. You may or may not want to also set network.cookie.maxNumber (the default is 3000).
felipe-alfaro.com 
hola, hace tiempo alrededor de 2 o 3 años que leo tu blog, me gusta mucho, se q emigraste a trabajar en un pais extranjero al tuyo y quiza por eso escribes en ingles tratando de mejorarlo……… para los hispanoparlantes seria muy bueno si tuvieras 2 versiones de tu blog uno en ingles y otro en español, a mi me agradaria mucho ya que en ocasiones no entiendo del todo y no porq escribas mal sino porque mi ingles no es muy bueno, gracias
i can’t log in to my gmail.on firefox beta4
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