UPDATE: Unless I mention the old Mac computer, assume that I am writing about your new Mac computer.
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From here on, I’m revising what I wrote on Wed., Mar. 9th evening. With the aim now, to establish the “Brave Safe Storage” entry in the Keychain of your new Mac:
. . . and then coaxing the Brave Browser.app (on your new Mac) to create a new BraveSoftware folder at:
/Users/[username]/Library/Application Support/BraveSoftware/
The following process, will eventually include the removal of the currently existing BraveSoftware folder at that location.
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My apologies, re your new Mac, I never asked if you had tried toggling the Brave Browser > Settings . . . switch positions (trying different combinations):
Setting that notion aside . . .
Now, instead of testing, please Disable both of those switches, and then Enable in the Clear browsing data [On exit] window, Passwords and other sign-in data:
brave://settings/clearBrowserData
. . . and then close the Settings and other Brave Browser windows, and Quit Brave Browser.
Next, Start up Brave Browser, and adjust the Clear browsing data in order to Disable the clearance of Passwords and other sign-in data on exit.
Next, Enable both Passwords switches mentioned previously (“brave://settings/passwords”), and then close the Settings and other Brave Browser windows, and Quit Brave Browser.
Log out of your Mac. Wait a moment. Log into your Mac.
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GETTING INFO FROM OLD MAC
Now, take a look at the old computer > Keychain > Brave Safe Storage info.
You can read and write down (by hand on paper), the password (see Show password):
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RETURNING TO WORK ON YOUR NEW MAC
On your new Mac, start up the Keychain application.
Under the File menu, select New Password Item:
You should get a pop-down window (the following or similar to the following):
For “Keychain Item Name” enter “Brave Safe Storage”
For “Account Name” enter “Brave”
For “Password” enter what you wrote on the piece of paper.
When ready, click the “Add” button.
In the Keychain application window, you should be able to find the new item – example:
Double-click on the “Brave Safe Storage” [name] entry, and its info window should open.
Examine the Attributes tab. If the “Where” field is blank, you may enter: “Brave Safe Storage”
Click on the Access Control tab:
Select the settings as you see, Enable only the “Confirm before showing access” button.
“Brave Browser.app” might not show, as having access.
If so, click on the + symbol button. A Finder navigation window should appear, and you would then navigate to the Brave Browser.app at
/Applications/Brave Browser.app
Once you have that set up, Quit everything.
Log out of the Mac. Wait a moment. Log into the Mac. Then start up the Keychain application and verify that the Brave Safe Storage entry and its settings are intact. Then Quit the Keychain application.
Now, move the BraveSoftware folder
/Users/[username]/Library/Application Support/BraveSoftware/
. . . to the Desktop. Select the BraveSoftware folder, there on the Desktop and use the Compress “BraveSoftware” selection in the Finder > File menu. Keep the “BraveSoftware.zip” compressed result on the Desktop, and move the “BraveSoftware” folder to the Trash.
Because, my guess is, that upon starting up Brave Browser, the browser and the new Keychain entry (Brave Safe Storage), are going to meet up (you might be prompted) . . . and then Brave Browser will use that Keychain entry (its password) for items and work to be done within folders of a newly-created BraveSoftware folder.
Here, no uninstall and reinstall of Brave Browser, because I am guessing that it is better, now, to maintain the relation set up between the Keychain, Brave Safe Storage entry’s Access Control setting and the Brave Browser.app.
Start up Brave Browser.