The last update Is pretty wonky for me. How does one downgrade an AUR package?
You can’t. Your only option is to uninstall it.
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If you build it from source - it usually possible to checkout a previous release/tag and build from that.
I initially understood it as Chromium - so my suggestion possibly don’t work as Google Chrome probably is repacked from deb package - or something …
I had a feeling it couldn’t be downgraded 
I guess it’s time to install Chromium and get it set up while I wait to see if the next Google update fixes anything. It’s still usable, but it’s pretty annoying in its current state.
An alternative where a downgrade is possible is to install it via an added repository, most preferably from an Arch Trusted User (TU), just fyi.
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You can review some versions available at pkgs.org Warning! they are third party repositories
Well, I turned off hardware acceleration, and that’s fixed the symptoms for now. Other applications that rely on the graphics card (like Stellarium) seem to run just fine.