What value to put in for a preference in the about:config forlder that would allow me to use the f12 key to enable/disable a firefox add-on.

Im trying to set it up so hitting the F12 key will enable/disable Addblock Plus because their are some web sites I need it disabled completely on.
The preference is already there in the about:config screen but the value is left blank for you to fill in if you want to use the feature.
I just need to know what value would represent pressing the F12 Key

'''F12''' is what you need as the string Value for '''extensions.adblockplus.enable_key'''

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