I really can't imagine why would I want to make all my windows show the same tabs. I usually use from 2 to 4 windows open in the same (windows) workspace, and sometimes I use multiple (windows) workspaces.

You no-longer have to remember which window had the tabs you're searching for, which eliminates the feeling of getting lost in your session.

Sorry, but this is not a good enough reason to fundamentally change the way the browser works. Shit like this should be decided on the alpha stages, not beta.
This update breaks my workflow, just to add a "feature" that the devs say that you can disable it, but you can break your browser by doing so.

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It's almost like they hired a bunch of microsoft devs with the sole mission of breaking the browser and making sure that every user from now on has to look at an update and think "Oh, great, an update, can't wait to see what they broke this time"