Why aren't my google chrome extensions working?

i downloaded the facebook 'poke all' button and when i try to use it, it isn't there. i went into 'settings', then 'tools', and then 'extensions' and it says:





Facebook Poke All - Version: 1.6


Adds a 'Poke All' button to facebook


Disable - Uninstall Allow in incognito





but every time i try to use it, it doesn't work :(


can someone help me and tell me what i'm doing wrong? thanks in advance x





here is where i downloaded it from:


https://chrome.google.com/extensions/det鈥?/a>


some people are saying it works and others say it doesn't.|||I think facebook has changed the code of their site after that the script were last update.