FlashPlayerPlugin 13 threads continually increase

Hello everyone.
Since upgrading to the latest version of Flash, I've been having troubles with Windows itself becoming stuttery and doing things like having my mouse cursor stop moving for a few seconds, and even moving the cursor over flash objects is causing my computer to completely lock up for a few seconds. Until now I wasn't able to figure out what was causing it, and I even went and bought a new video card, thinking it had finally broken. But today, I loaded Firefox and the freezing started again, so I went and looked in the Windows 7 Resource Monitor. I'd looked before, but previously I'd sorted by Average CPU. This time though, I sorted by Threads and saw that FlashPlayerPluging_13_0_0_182.exe was using 1400, and the number was continuously increasing, even though I wasn't -doing- anything.
I closed Firefox, reinstalled Flash Player, then started Firefox again and loaded a single tab, played a Youtube video, and then let the tab remain open after the video ended. And again, the threads were rising again, they're currently reaching 700 as I write this. Sometimes the number drops down by one, but then continues rising again. As a note there are two instances of FlashPlayerPlugin_13_0_0_182.exe running in Task Manager, and even setting the affinity of both to a single core has had no effect. Closing tabs with Flash objects drops the threads down to single digits, at least.
My PC specs are:
Gigabyte MA78LMT-S2 Motherboard
AMD Phenom II X4 840 CPU
AMD R7 260X Video card
8GB DDR3 RAM
2x SATA Western Digital HDDs
Windows 7 Pro x64
Latest video card drivers
Edit: After some testing, thread count rises in 11_7_700_275 as well, but it does so much more slowly, and stops and drops back to baseline levels if Flash isn't doing anything for a while, unlike 13.

I suspect adware, as I haven't seen this with XP, Vista, 7, 8 or 8.1 on six different machines.

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