Seumsiden.online is a hoax page that delivers questionable content to its visitors and tries to trick them into subscribing to its push notification services. The website is in no way a unique occurrence, as the Internet has been flooded by countless such pages that are almost carbon copies of each other. It seems that this trend is not slowing down and more pages dedicated to proliferating this browser-based tactic emerge each day.
It is extremely unlikely for users to land on Seumsiden.online on their own. Instead, in the vast majority of cases, they were brought there either by a redirect from a previous site, a questionable ad, or a PUP (Potentially Unwanted Program) that may be lurking inside the users' devices. If you suspect that such an intruder might have indeed sneaked itself onto your computer, the best course of action is to run a thorough scan with a professional security solution.
As for Seumsiden.online, one of the potential schemes it may employ is to pretend to be running a CAPTCHA scan for bots. Of course, this is all fake and just a ploy to lure the unsuspecting user into clicking the 'Allow' button. If you follow the instructions, the dubious site will receive enough browser permissions to start running an intrusive advertising campaign. The delivered advertisements should be approached with caution, as they may lead to more equally untrustworthy places, including phishing pages, online tactics, shady gaming platforms and more.
Users affected by Seumsiden.online are advised to open the respective menu on their browser ('Notifications,' 'Permissions,' or something similar) and then revoke all permissions that have been granted to the page.