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javascript injection is not working on my firefox 15.0

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Hi, I m using javascripts in game Tribalwars and javascrip injections are not working on firefox 15.0 I m trying to edit cookies but it just not working. i searched the web and found out that from firefox 6 to later javascrip injectons are disabled. Is there a way to turn them on?

Hi, I m using javascripts in game Tribalwars and javascrip injections are not working on firefox 15.0 I m trying to edit cookies but it just not working. i searched the web and found out that from firefox 6 to later javascrip injectons are disabled. Is there a way to turn them on?

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Are you using Greasemonkey, Scriptish, or another add-on to inject the scripts, or are you trying to do it in another manner, such as using bookmarklets?

Firefox did change how the urlbar works: in the old days, you could paste and run a script from the address bar, but that has been disabled. Instead, you can use a bookmarklet or (if you can give up some screen real estate) the Web Console.