1) Right click on password field
2) Click on Generate Password
3) Confirm.

Observe that the generated password is only filled into the password confirmation field, not in the one where you generated the password.


Captured password manager logs are listed below. Logs are cleared and no longer captured when all password-manager-internals pages are closed.
The new state of the UI: 0
Message: PasswordAutofillAgent::SendPasswordForms 
only_visible: false
Security origin: http://www.pizzabox.com.hk/ 
Number of all forms: 0
Message: Generation invalid PasswordForm 
Message: PasswordAutofillAgent::SendPasswordForms 
only_visible: false
Security origin: http://www.pizzabox.com.hk/ 
Number of all forms: 0
Message: Generation invalid PasswordForm 
Message: PasswordAutofillAgent::SendPasswordForms 
only_visible: false
Security origin: http://www.pizzabox.com.hk/ 
Number of all forms: 0
Form is a password form: {
Action : http://www.pizzabox.com.hk/ ,
New password element : anonymous_new_password ,
Origin : http://www.pizzabox.com.hk/ ,
PSL match : false,
Password element : anonymous_password ,
Password generated : false,
Scheme : HTML ,
Signon realm : http://www.pizzabox.com.hk/ ,
Times used : 0,
Username element : anonymous_username 
}
Message: PasswordManager::CreatePendingLoginManagers 
SSL errors present: false
IsPasswordManagementEnabledForCurrentPage: true
Number of pending login managers (before): 0
Adding manager for form: {
Signature of form: 4470587299083691146
Signon realm: http://www.pizzabox.com.hk/
Origin: http://www.pizzabox.com.hk/
Action: http://www.pizzabox.com.hk/
Form name: 
Form fields: 
addressInput: 2914458719, type=text
: 1318412689, type=text
securityCode: 1305695504, type=text
: 1318412689, type=text
: 475301429, type=password
: 475301429, type=password
: 1318412689, type=text
: 1067852723, type=checkbox
addressInput: 2914458719, type=text
}
Message: FormFetcherImpl::Fetch 
FormFetcherImpl::state_: 1
Number of pending login managers (after): 1
Generation possible account creation forms: 1
Message: Generation: no non-blacklisted confirmation 
Message: FormFetcherImpl::OnGetPasswordStoreResults 
Number of results from the password store: 0
Message: PasswordFormManager::ProcessMatches 
SSL errors present: false
IsPasswordManagementEnabledForCurrentPage: true
Message: Generation: no server signal 
Message: Show generation popup 
Message: Generated password accepted 
SSL errors present: false
IsPasswordManagementEnabledForCurrentPage: true
Message: PasswordFormManager::ProcessMatches 
The new state of the UI: 2