How to always allow specific local protocol

Thanks a lot AndrewSAIF. I didn't have to use a master_preferences or powershell to edit Preferences. I simply right-click it and choose to open it with my text editor "vscode" 

Once open, Preferences looks like a json file, so you should be able to open it with any text editor. But your operating system doesn't know that because the extension is removed.

This work for me (to allow zotero and vscode protocols):

- close Edge

- go to %localappdata%\Microsoft\Edge[version]\User Data\Default [or profile name]\Preferences.

- Right-click Preference and choose a text editor

- scroll down to the very end of the text 

- remove the last

}

- add  (notice the first comma, and no need to add :// for the protocols

,"protocol_handler":{"excluded_schemes":{"zotero":false, "vscode":false}}}

edit: once you edit have edited Preferences and open Edge, the position of the protocol_handler will automatically be move just beneath "password_hash_data_list" so you won't see it anymore right a the very end of the text. So after the first edit, if you need to add more protocols, you will have to look for "protocol_handler".