"Forget About This Site" Insanely CPU Intensive, Takes Forever/Crashes Browser -- Same for all history deletions

I have over 6 months of browser history, and I browse twitter a lot. I want to "Forget About" Twitter. Whenever I try to do that, Firefox just hangs, and becomes impossible to use. It's the same if I try to delete, say, everything from 6 months ago.
Deleting my browser history should NOT be a browser-breaking process. My rig is a Phenom IIx4 build, and I'm running off of an SSD. Maybe you guys have tied up all of the browser history into some complicated cache for the URL bar, I don't know. But this is pathetic. If I can delete 10GBs of crap from my HD within seconds, I should be able to delete my browser history.

randomanon1234,
You posted here with PaleMoon in the Firefox support forum, and didn't specifically refer to which version of Firefox your problem is/was with. We assume that the support question is about the browser used to post here, unless that is obviously incorrect; like the thread was started on a Mobile device, or using IE or Chrome - then we ask, if the Firefox version wasn't stated along with the question.
You might think PaleMoon and Firefox are the same and that I am "splitting hairs", but "we" have had a discussion with and initiated by MoonChild of the PaleMoon project in the Contributors area over "us" referring to PaleMoon as a "3rd Party build" of Firefox. He insists that PaleMoon is a Gecko "fork", not a re-branded version of Firefox - IOW, a completely separate browser that uses much of the same code that is in Firefox. MoonChild also informed us that the PaleMoon project had their own support forum, and asked that we refer "his" users that come here, over to the PaleMoon project forum for support.
Now, if that constitutes my being "snarky", I apologize. If you are talking about problems with a version of Firefox that you used to use, you may provide feedback to Mozilla here - https://input.mozilla.org/en-US/feedback
If you aren't using Firefox now because of that problem, this conversation isn't a "support topic".

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