LONDON (AP) — The maker of one of the Internet’s most popular browsers is taking on one of the world’s best-known purveyors of surveillance software, accusing a British company of hijacking the Mozilla brand to camouflage its espionage products.

The Mozilla Foundation — responsible for the Firefox browser — said late Tuesday that Gamma International Ltd. was passing off its FinFisher spy software as a Firefox product to avoid detection. Mozilla described the tactic as abusive.