How to lock a browser with a password/passcode on iPhone? Is there a way to make a Web browser on iPhone 11 Pro other than Safari to be lockable with a password or a passcode, even by any extension? That is, when you launch the browser, a password is required. The password isn’t asked again while the browser remains open, even in the background. If you close the browser app, then it will ask for the password at the next launch.

Screen Time blocks all browsers but I need to lock only one web browser, not every browser.

Firefox has passcode feature, but only for saved passwords, not opening the app itself.

Additionally, I look for a solution that doesn’t require me to set up a passcode, Touch ID or something similar on the whole iPhone. I want my iPhone to remain unlocked, except for the browser.
iCab Mobile has had this feature since at least 2012.

iCab » Settings » Account

(iCab is, by far, the most feature-rich browser on iOS. I’ve referred to it as “Safari Pro” for many years.)