Recent versions of Firefox frequently freeze up

I've happily been using Decentraleyes for a good while now. Thanks for making it!

After updating Firefox from v62 to v63, I'm experiencing frequent and complete freezes of the entire browser window. It's triggered by actions such as switching tabs, focusing input fields or scrolling (especially large pictures) and lead the main Firefox process to consume 100% CPU. The browser thaws after a few seconds, but switching to another tab and back usually triggers another freeze.

Disabling Decentraleyes instantly resolves these problems. They return after re-enabling it. This is weird, I don't think an extension should, or could, cause such issues. I suspect this to be a Firefox bug merely triggered by Decentraleyes. My intuition points at memory allocation problems, but I really don't know.

Firefox 63 on Linux, compiled from source Decentraleyes 2.0.8