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Imagus - The extension is intended to complement image features that (I think) is missing from Opera by...
globalquiz.org - Difficult, multiplayer and multi-language trivia game.
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
HugeQuiz - test your knowledge with a variety of quizzes about everything.
Thumbnail Zoom Plus - The official site of the Thumbnail Zoom Plus add-on for Firefox
JetPunk - JetPunk is the biggest online quiz platform that contains sports, geography, music, movies, and more regional or international information and database, created by H Brothers Inc.