In previous versions you could search your about:config on the "value" field, this is no longer possible. Searching for https:// and http:// would give you a list of numerous URLs, most of which are under Mozilla's own domains. Some might argue that things like updates are necessary to ensure a secure browser. Others might argue that they have run very outdated browsers without problems for years, and that combined with forced updates and the Maintenance Service, the log files generated produce a not-insignificant amount of information about users.