Firefox is a good browser and the best of the three good ones for Windows. However, for speed and easiness of use, you might give Google Chrome a try. I like it just fine. There's always IE 11, but it's not too quick either. Give Chrome a try, you might just like it.
I use Firefox as my main browser but I do agree, it can be slow at times.
Obviously if there is a problem with your computer, then that will make a difference to your browser's speed too, but if you are sure that all is well, then it looks as though a change is what is needed...
Or at least once you change browsers, you will know for sure whether it was Firefox that was causing the problem!
I would choose Google Chrome. It is fast and reliable, plus it has the 'Okay google' feature enabling you to use your voice if you are too busy to type.
It's a popular browser and the search feature is second to none. You can download Google Chrome from https://www.google.co.uk/chrome/browser/features.html
An alternative is Safari.
Yes I know it's an Apple product. but there is a Windows version and it is rather good to be honest. If you are interested in Safari you can download it from http://support.apple.com/kb/dl1531
Just simply .. Try using Chrome!! I use Chrome regularly .. No complaints to date
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