If you use the uBlock Origin extension in Google Chrome or Edge, you should probably start looking for alternative browsers or extensions—either way.
A few days ago, users noticed that Google had begun disabling uBlock Origin and other Manifest V2-based extensions as part of the migration to Manifest V3.
Now, Microsoft Edge appears to be following suit.
The latest Edge Canary version started disabling Manifest V2-based extensions with the following message: "This extension is no longer supported. Microsoft Edge recommends that you remove it."
Although the browser turns off old extensions without asking, you can still make them work by clicking "Manage extension" and toggling it back (you will have to acknowledge another prompt).