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Should I believe the advice on internet sites to speed up Firefox and if so, why are these not included in Firefox in the first place? Do you recommend any of these, or have any of your own?

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I have already asked my question on the previous page!

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Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4

I have already asked my question on the previous page! == User Agent == Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.99 Safari/533.4

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No. Many of those tweaks provide little, if any benefit, while others can get you banned from some websites for having too many connections to their website.