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Best HappyViewer Alternatives
Here are some Firefox add-ons that are similar to HappyViewer:
hitomiViewerEZController
오케인
7 0.00 
(0) 
Chzzk VOD Highlighter - 치지직 다시보기 하이라이터
냥마로
12 0.00 (0) 
viewerCanPlay
Player
17 0.00 (0) 
SeikisoViewer
なかむーら
148 3.83 (6) 
StelCount MultiView Extension
citysquirrel
4 0.00 (0) 
Ruliweb Extension
sweet_extension
152 4.80 (5) 
HashaToHitomi
오케인
1 0.00 (0) 
트위치 커스텀 아이콘 선택기
lapis
10 0.00 (0) 
MultiFreeca
chz.app
13 5.00 (1) 
TVer Unofficial Extension
Michael
17 0.00 (0) 
Streaming+ sequencer
windyakin
11 0.00 (0) 
AcFun helper
Sokwva
6 0.00 (0)