The most probable reason
"The Gotham Font Was Not Found" ads are appearing is because of an ad-supported program infection. These scam advertisements will attempt to convince you to call Tech support so that con artists can get remote access to your operating system and install unwanted, expensive software. If you're dealing with adware , the warnings will be pretty intrusive. If you carelessly install freeware, it isn't shocking that an adware is installed. The adverts are not dangerous, and as long as you do not fall for the scam, you will be fine. If you did call them, you would be put through to competent con artists who would pretend to fix your computer, and then request an illogical amount of money. Permitting some dubious tech-support remote access to your device might turn out to be a very bad idea, so you need to be cautious. And when it comes to this advertisement, just ignore it, you're device isn't in danger, neither is your data. When you remove "The Gotham Font Was Not Found", the adverts should disappear, and your browsing will no longer be interrupted.
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