Firefox running slow, even after the reset AND reinstalled

For the last several days that Firefox has worked really slow. When I open a new window it takes about 20-30 seconds to open an or if I try to load a site with flash (say for example of youtube) it takes time to load the site and you can not click anything, like back, address bar or even the X to close the window.

I have scanned for viruses and found nothing. I thought it was my computer when Firefox started to slow down, but I opened Opera and Saferi to see what it looked like and they are fine. Works very well. If I restart the computer, Firefox works fine for say 2 hours before you start to slow down slowly again over time (about 5 hours later it is uber slow!). I also reset Firefox that again gave the same result as the computer restarts, very well for a few hours before starting to slow down again. Reinstalled Firefox, but again it's very well for a few hours.

I don't know what to do. Firefox is my main browser, but I can't continue to use it like that because it takes forever to do anything.

Create a new profile as a test to see if your profile is the source of the problems.
See "create a profile":

Profile backup and restore

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