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We have lost several web engines over the years.

Mariner
libwww
Tasman
Original KHTML pre webkit
Trident
EdgeHTML
Presto
Servo
Netrunner

The only five left are Webkit, Chromium, Gecko, Goanna (Pale Moon/K-meleon) and Ladybird (SerenityOS browser), of which only Webkit and Chromium have dominant market share. Google mostly blocks Youtube/Gmail account sign in's in browsers it doesn't approve of (as "insecure"), and Firefox will die as websites will block it for being known as the ad-blocker browser after manifest v3. (Brave doesn't use its own user agent for this reason).
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