Via Firefox
1. Download and install Firefox from http://www.mozilla.com.
2. Launch Firefox. Select 'Tools' from the toolbar, then select 'Add-ons.' A new window will open.
3. Type 'Adblock' into the search bar of the new window and press return. Adblock Plus will be the first result. Select 'Add to Firefox.' Click 'Install Now' when prompted.
4. Restart Firefox in order for the installation to take effect.
Via Safari
5. Download and install Safari from http://www.apple.com/safari/download.
6. Download Safari adblock from http://www.burgersoftware.com/en/safariadblock. Open the .dmg file after downloading and follow the on-screen instructions to install adblock.
7. Restart Safari to activate the adblock plugin.