If your Mac OS is 10.5 (Leopard) then you can use Parental Controls in System Preferences. Select the Content tab and then tick limit access to adult sites. Use the Customize button to add specific criteria to your block. Websites already visited are listed in the Logs section. I am not sure if this can block websites in firefox, but if you only use safari, here's how:
1. Log in with an admin account
2. Open System Preferences, then click "Accounts"
3. If the padlock in the bottom left corner is closed, click on it, then type your password. otherwise, proceed to step 4
4. Select the account you want to put a Block on, then click "Parental Controls"
5. Mark the "Safari" checkbox
6. Log on to the account, and open Safari
7. In the bookmarks bar, click the icon of the book with the padlock over it, and enter your user name and password
8. Add to the Bookmarks Bar any sites which you want to allow.
You are done! If you try to open any site which is not in the bookmarks, you will get an error screen, with a button that you can click to create a bookmark for the site after entering your (admin) username and password You can use a parental control software web site porn filter to achive this. Safe Eyes is a nice choice. See the link below.
The Mac OS X Parental Controls section of System Preferences allows for the blocking of access to certain applications. Terminal would be a good choice to block if the owner did not want their computer messed with.
you pug in another Mac Os using a cord( don't know which) and you can over rid it
The System Preferences with Mac OS X has a Parental Controls section which can be used to limit access to certain software, websites, email and instant messaging contacts. It also provides time limits for when the user can access the computer and it keeps logs so activities can be monitored.
There are many online websites that have a mac 187 brush for sale. Some of these online websites include MAC Cosmetics, Amazon, Macy's, and Nordstrom's.
www.caremark.com
One can purchase a Power Max G4 at various online websites. Some websites include Every Mac, The Mac Store, and Gigaom. At a discount price, it can be purchased from Amazon.
Click
Anything downloadable can be downloaded on a Mac, depending on your settings it might block but that can be prevented by tweaking the download settings
software.informer.com mac.informer.com
The Block ID
Buy a mouse with a wheel or change the button required to use pick block.
Well, I definitely know about themacuser.org. It is by FAR the best mac site EVER.