Also good to keep non-chrome browsers alive.
- https://addons.mozilla.org/en-US/firefox/addon/multi-account... - bit easier to manage, you can place a sensible button next to "Open a new tab" that gives you a menu to open a new tab in specific container, also easy to assign site to a container which is vital
- https://addons.mozilla.org/en-US/firefox/addon/temporary-con... - this makes a temporary container every time you open a new empty tab (if you open a tab from within it stays with the temporary container), when you close the last tab from the container it will remove the container after a while. This extension should not be used with tab syncing from the former extension if you use Firefox Accounts to sync tabs and stuff.
- https://addons.mozilla.org/en-US/firefox/addon/i-dont-care-a... - this makes it manageable to use the temporary containers extension. Because every time you open a new tab with new Google search you will see a cookie consent popover. It gets old fast, this clicks it for you.
Frankly, that's all I have now. You can't customize the UI like you used to, the extension marketplace for FF and Chrome are pretty much parity, and the speed of FF (and Chrome) is great. I think they're both power hungry, though.
Both are recommended by Mozilla, so they are checked to not be malicious. Recommended extensions are another bonus over Chrome as you cannot tell in general if a chrome extension is safe.
https://addons.mozilla.org/en-US/firefox/addon/simple-tab-gr...
https://addons.mozilla.org/en-US/firefox/addon/sidebery/?utm...
https://github.com/gorhill/uBlock/wiki/uBlock-Origin-works-b...