Last time I tried Firefox, a few months ago, tab switching was painfully slow as compared to Chrome. I intend to give it another chance soon, though.

What about a hardware upgrade?

Lol - no. My computer isn't that old. Chrome switches tabs instantly. Firefox doesn't. I'm not going to buy a new computer to find out if Firefox will then switch tabs faster. Also, I've read similar complaints from others. Maybe it's faster now - I dunno. When Firefox's tab switching is faster, I'll give switching another go.

Are you using any plugins to achieve this number of open tabs and and still have good performance?

It appears to work fine even without extensions (Ubuntu 16.04, Firefox 62), but I have some garbage-blocking extensions installed.

In my main Firefox profile, I use umatrix[1] to browse the WWW with all CSS and JS turned off by default, enabling them only when needed. Reader mode makes most articles readable with a single click.

Firefox's built-in privacy protection is also enabled.

If a website doesn't work with my settings, it takes about the same time to override the CSS/JS settings than the difference between an unblocked page load and a blocked page load. Pages load much faster in general, so it's a net gain in free time.

I also use Stylus[2] to turn off all CSS animation and add custom styling to websites.

[1] https://addons.mozilla.org/en-US/firefox/addon/umatrix/

[2] https://addons.mozilla.org/en-US/firefox/addon/styl-us/

Thanks. I'm also a fan of umatrix.

I'n curious why you disable CSS, obviously I understand why you would want to turn of JS. Is this part of the override for Stylus to work? It didn't look like it from the link.