Some users are very tired of the age verification screen.
When opening certain pages in Steam, age verification is activated: the user needs to specify their date of birth before viewing the page.
However, Steam does not remember the age, and therefore players periodically have to go through the verification screen again and manually enter the data again.
Modder shimoris got tired of this and offered a solution: he developed the "steam-verify-age-bypass" extension, which will allow you to skip the "annoying age verification notification on the Steam store page."
Due to legal requirements, Steam is forced to always ask your age when viewing games rated PEGI 16 and above. This [extension] removes the check once and for all. It is for the Steam client, and NOT for the Steam page that you use in your browser. In essence, data is written to the local Steam storage so that it remains in memory. This saves you from having to enter your date of birth again.