When I open my browser (Firefox), I successfully unlock the extension.
But, when i lock the extension i still have access to the search and list button and can access to the passwords without unlock it.

Steps to reproduce

1. Install and Setup the extension
2. Open your browser (Firefox )

Expected behaviour

1. Install and Setup the extension
2. Open your browser (Firefox )
3. Unlock the extension
4. Lock the extension
5. Can't use the extension untill you didn't unlock it.

Actual behaviour

1. Install and Setup the extension
2. Open your browser (Firefox )
3. Unlock the extension
4. Lock the extension
5. You can still use the search button and have access to your password without unlock the extension

Configuration

Windows 7 64bits:

Firefox 59.0.2 (64bits):

Passman 2.1.4:

Extension 2.1.1:

Nextcloud 13.0.1:

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