Identify and remove scammy browser extensions, abusive notification permissions, changed search or home-page settings, and obvious adware without pretending every pop-up means the whole computer is infected.
Assess possible malware by separating weak clues such as ordinary slowness from stronger evidence such as persistent redirects, unauthorized settings changes, unknown software, disabled security tools, and suspicious account activity.
Clean up a browser that has become slow, confusing, or overloaded by reviewing extensions, startup pages, notifications, search settings, sync behavior, and profile health while preserving bookmarks and account access.