HugeQuiz - test your knowledge with a variety of quizzes about everything.

Hover Zoom - Enlarge thumbnails on mouse over.

The Quizopedia - The Quizopedia is a top-notch quiz-based application that provides the overall development of the interesting candidates by offering interesting quizzes focused on enhancing analytical, reasoning, and decision-making skills.

Imagus - The extension is intended to complement image features that (I think) is missing from Opera by...

AlltheTests - AlltheTests is an online platform for testing intelligence and command over current affairs, including Cartoons, Mangas, Books, Games, Satire, Knowledge, EQ tests, Social media, Sports, and celebrities’ related tests.

Image Max URL - Help find larger or original versions of images, including a customizable image popup feature