Firefox for Android app, build 132.0.2. When opening the password tab, the prompt to enter your devices pin or password appears as it should. However, spamming the "cancel" button on the prompt or the Android's back button (about 4 or 5 times) allows you to go to the password manager and view all usernames and passwords without reentering the device's pin/password. To recreate: open the password tab, enter pin prompt opens, pressing cancel reopens the pin prompt, pressing cancel 4 or 5 times opens the password manager without verification.