[SECURITY] Master Password does not work until browser restart

[shinenelson]

Steps to reproduce

1. Install the Extension
2. Login to Passman vault
3. Set a Master Password ( do NOT remember it locally; what's the point of a password manager if the master key is stored unencrypted on the local file system? )
   -> Do NOT restart the browser
4. Click the lock icon to lock the extension
5. Click 'Unlock' button
6. Search for saved password from vault

Expected behaviour

The extension should report an error ( #320 ) and not unlock the vault.

Actual behaviour

Due to #320 and probably because the password vault was just unsealed during setup, it is still accessible. And unlike in #320, the extension is active and triggered on website form fields. However, they don't autofill into the form fields, unlike when in properly unsealed mode, the fields are automatically filled in. All passwords is directly accessible and viewable ( at least ) from the extension though.

Screenshots

Search in locked state

Triggering on websites

Configuration

Operating system: Ubuntu 18.04.4 LTS

Browser: Firefox 75.0

Extensions that might cause interference: Nextcloud Passwords, LessPass

Passman version: 2.3.5

Extension version: 2.1.1

Nextcloud version: 18.0.0

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