Firefox keeps slowing down/freezing after update, have to keep closing/opening it again to fix it

''locking as a duplicate of https://support.mozilla.org/en-US/questions/1035358''
I think it's flash related? I lose sound whenever it happens too, not just in the browser, the whole computer. as soon as I close/open firefox again, it's fine. Until it happens again, anyway. Never had this problem before today's update

* Websites remembering you and automatically log you in is stored in a cookie.
* You need an allow cookie exception (Tools > Options > Privacy > Cookies: Exceptions) to keep that cookie, especially for secure websites and if you let cookies expire when Firefox closes
* Make sure that you do not use [[Clear Recent History]] to clear the "Cookies" and the "Site Preferences"
Clearing "Site Preferences" clears all cookies, images, pop-up windows, software installation, and password exceptions.
* Make sure that you not run Firefox in (permanent) [[Private Browsing]] mode

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