Browser-tools.systems is untrustworthy domain, that is used by advertisers to create ads, pop-ups, landing pages. This website redirects users to commercial third-party resources or even malicious pages. It may appear in Google Chrome, Mozilla Firefox or Internet Explorer. The reason of it is quite simple: you have adware program or add-on installed in browsers. Currently, according to our research, there is extension called “Browser Search Update 77.33.42” responsible for generating Browser-tools.systems pop-ups.