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I am looking to block or remove a line of javascript from a specific website before it finishes loading. Is it possible to do this in firefox? Any specific plugins?

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I haven't tried it, but Greasemonkey allows you to control your web pages, including edits and deletions. This is where I'd start first, though you'd need a bit of coding to do it.

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You can block entire scripts with noscript and I think you can also change the files that load. Play with it its quite cool and very useful!

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