Foxmarks: Error: Forbidden
From Foxmarks Wiki
If you see this error message, it typically means that you have disabled cookies. In order for Foxmarks to work, you must have enabled cookies for the foxmarks.com domain. If that doesn't work, try enabling full encryption by going to Tools > Foxmarks > Settings > Advanced tab > Encryption > "Encrypt All".
Some users have seen this error due to a firewall or proxy (such as ZoneAlarm) blocking requests sent to sync.foxmarks.com--check your Foxmarks log file (found in Tools > Foxmarks > Settings > Advanced tab > Show Log File) to see if that's the case. If the instructions above to set "Encrypt All" do not fix the problem, then speak to your system administrator about how you might gain access.
