I do this too! I pair Temporary Containers with the Containerise add-on which lets me create persistent containers for a few specific sites that I want stay logged in to.

This setup works well with one glaring exception... Cloudflare and their stupid boats. Using temporary containers for everything has really shone a light on just how much of the web Cloudflare is gobbling up. Cloudflare throws a captcha at me every time I visit any website they gatekeep for. I'm talking mostly about random sites that turn up in web searches. Its annoying enough that when I encounter a Cloudflare captcha, I just close the tab and try the next site.

Now I'm wondering if there's a way to eliminate results from web searches that use Cloudflare with something like the uBlackList add-on.