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Thanks for the recommendations, but I have both and some more. I wish there were an easy way to drill down on what exactly is consuming power.

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Have you looked into the about:performance page? It might give you clues.

I have, but nothing stood out. I even tried Firefox Profiler (which is pretty good btw, kudos to the team), and it looks like DOM processing and renderer both spend a lot of CPU. But alas I'm not a frontend developer and have no incentive to dive deeper :)

It could be specific websites. Google web apps are notoriously hostile to Firefox.

I leave Javascript off by default on uBO and only allow it selectively when I have something to gain on each website.

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