Some users have grown weary of the age-verification screen.
When you open certain pages on Steam, an age check is triggered: you must provide your date of birth before you can view the page.
Steam does not retain this information, so players are often forced to repeat the verification and manually re-enter their birth date.
Modder shimoris, fed up with the constant prompts, created an extension called “steam-verify-age-bypass” that lets you skip the annoying age verification on Steam store pages.
Due to legal requirements, Steam must always ask for your age when viewing titles rated PEGI 16 and above. This extension removes that prompt permanently. It works with the Steam client — not the Steam web pages you open in a browser. In practice, it writes the information to Steam’s local storage so the date remains saved, sparing you from re-entering your birth date each time.
Source: iXBT.games