Problems with Firefox 4 beta and cookies?
August 20th, 2010
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).
Firefox resolves DNS locally by default when using a SOCKS 5 proxy
April 10th, 2010
I just realized that Firefox 3.6 (at least on Mac OS X) tries to resolve DNS names locally when using a SOCKS 5 proxy. Instead of handing name resolution off to the Proxy, Firefox tries to resolve DNS names itself.
To have Firefox delegate name resolution to the Proxy, just make sure the network.proxy.socks_remote_dns configuration option is set to true, by navigating to the about:config URL.