If you're concerned about privacy online, anonymoX is a good option. When enabled, you'll be able to pick a random IP, delete cookies and view your public IP, all with a view to making life online just that little bit safer.
The problem with many IP hiders and proxies is that they are complicated to set up and can seriously slow down browsing. Not so with anonymoX. It installs as easily as a regular Firefox add-on, and automatically enables a random "identity". By clicking on the anonymoX icon beside the address bar, you'll then be able to pick a specific identity from the list provided, including US, European and Asian IPs.
anonymoX goes a step further by also helpfully prompting you to delete your cookies when leaving a website or changing identities, preventing that site from recognizing you. The app also lets you swap between its own service and
anonymoX is a good little service, although not particularly flexible. The configuration options are pretty much limited to what you see in the interface, but this means, of course, that the service is very simple to use. Using most identities, we also found anonymoX to be pretty fast, but, as always, some locales were slower than others, especially when choosing the US.
If you are looking for casual and infrequent IP hiding when using Firefox, anonymoX is a good free option. You could always upgrade to the premium service, but if you are looking for slightly more detailed and/or configurable anonymization, we suggest you look elsewhere.
For free, casual anonymization, anonymoX is a great, easy-to-use Firefox tool.