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Firefox is running too slow on my window 10 64bit. Please help.

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I am running firfox on my Windows machine dell latitude E5540 (windows 10 64 bit). But it is running too slow, and other programs are running fine, but when I launch firefox it becomes very slow. What could be the possible reason?

Chosen solution

I found that the problem was not with the browser but rather the problem was with the website.

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Is that a update or fresh FF install?

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No its a fresh installation. i also notice that there are some websites that take input from users and do something for example when i visit and use namobot.com in firefox it slow down my pc but not on chrome,

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Chosen Solution

I found that the problem was not with the browser but rather the problem was with the website.