Hopefully most of the missing extensions will be developed sooner rather than later. I have 15 extensions installed, 14 of which are "Legacy".

The most critical one, Tree Style Tabs, has been converted. That was the key blocker that prevented me from seriously using Chrome. But many more remain; Cookie Controller, RefControl, some kind of Classic Theme Restorer equivalent (to get a menu bar back for Bookmarks, at a minimum), etc.

Tree Style Tabs has been updated to a WebExtension.[1]

Getting a menu bar no longer needs an extension, you can just right-click in the blank areas near the address bar and select "menu bar".

uMatrix can control and spoof Referer sending (I'm unfamiliar with RefControl, so this may not be exactly the same.)

Self Destroying Cookies[2] is a good way to keep cookies under control, though again I'm not familiar with the addon you mentioned.

[1] https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta... [2] https://addons.mozilla.org/en-US/firefox/addon/self-destruct...

Self-Destructing Cookies is not a WebExtension, you want Cookie AutoDelete.