Firefox keeps slowing down/freezing after update, have to keep closing/opening it again to fix it, lose sound whenever it happens too

I think it's flash related, but i'm not sure. it doesn't crash/freeze completely, it just suddenly out of nowhere becomes excruciatingly slow, never did this before todays update

Boot into the Recovery Drive by holding down Command R when restarting.
Run Repair Drive and Repair Permissions using Disk Utility in Recovery.
Restart and run the combo updater.
OS X Mavericks 10.9.5 Update (Combo)
http://support.apple.com/kb/DL1760
However, you might need to reinstall OS X in the Recovery Drive. This process should not damage your data but it's always advised that you backup first.
If you don't have a clone backup it's time to start. Just like a seat belt and an air bag protect you in different ways when driving, you need both Time Machine and a clone for full protection.
Both of these applications can be used to create a clone. You will need an external drive to backup your data.
SuperDuper! http://www.shirt-pocket.com/
CCC http://www.bombich.com/download.html
Free space: It suggested you have a minimum of 10% free but this can vary depending on the size of the drive. When you get below 10GB free you need to start moving files off the drive.
You can keep your iPhoto and iTunes Libraries on an external drive. Hold down the option key when launching the app to point to the new library location.

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  • 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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