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If by "last time" you mean the pre-WebExtension version - yes, that version was rather CPU intensive and I used a different extension (no longer maintained post-WebExtension) back then.

I haven't seen any negative performance impact as far as battery or CPU usage are concerned, but as usual YMMV.

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I just gave it another try. Unfortunately, things haven't improved. `about:performance` shows a "medium" energy impact for TST. My 2015 Macbook's fans come on and stay on until I disable TST again, after which they reliably spool back down after a short delay. While TST is enabled, Firefox shoots up the list of CPU users in Activity Monitor.

Oh well, it was worth a shot, sidebar tabs are just so good when they're working well, but it's not worth the battery drain.

Your userChrome.css tweaks worked great!

As another point of data, with FF Nightly on macOS 10.14/2018 MBP and ~10 tabs, I see no fan activity and low-to-none energy impact.

Different OS (Linux, FF 64), but I was curious to know the impact here. TST has no discernible impact.

I'm using a bunch of other extensions and customisations, so I guess there's some dodgy interaction going on somewhere. No time to go spelunking though. I'll just use it on my desktop instead, where I won't notice the load.

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