The best way is to carry out a mod to the user file .. this is the same as modifying the hosts file in Windows for Internet Explorer. It will automatically block any known ad site (or bad site) from displaying content .. therefore displaying many affected pages quicker.
For Firefox users .. Go to this page ..
http://webdesigns.ms11.net/chromeditp.html
Download to desktop ChromEdit Plus version 2.9.0
Open Addons in Firefox and Extensions ..
Open Install .. select xpi file you downloaded ... or DRAG the xpi file onto the Add0ns/Extensions window and let it install.
When done, open Options from ChromEdit Plus addon
Open the Chrome Folder tab.
R Click on UserContent.css and 'open with' Notepad
Seperately ... Go to this web page and highlight EVERY part of the text (top to bottom .. and copy.
http://www.i-hacked.c...eefiles/removeads.txt
Paste into the open notepad window so you see all the text appear
Click on File .. Save and close the text file and close addon and Extensions.
Reboot Firefox ...
and you will nver see most annoying ads in Firefox again.
To reverse, just open the User file again and delete all the contents/save.
The reason for adding the Chromedit is ease of modification to Firefox, as other things can be modded!
Ad-Block can cause many slowdowns itself by the way it operates.
A Host file mod will always be faster.