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NOTICE - Be Sure to have the latest install of IE and latest updates to IE9 even if you use firefox or Google Crome, due to League of legends nature it requires these updates at least!, be sure to have them even if you don't use them
if the addon's down below do not support firefox 4, Downgrade it to 3 until firefox does support them, check the addon page to find out if supported by 4 or not
Still searching for a Older version of firefox other then 4, if anyone has the link please provide it if you would be so kind
Always use the Rule of thumb, Do your research and double check the Links before hand, These will not promise you full protection but they help, WoT Gives Reputation on sites, anything with a low rep I'd Avoid unless you personally know its safe
If your not sure about a "Zip" - "Exe" or whatever file you just downloaded you can always Upload it to