Imagus - The extension is intended to complement image features that (I think) is missing from Opera by...
Fellow.app - A manager’s co-pilot for 1:1s, meetings, feedback & goals 🚀
Image Max URL - Help find larger or original versions of images, including a customizable image popup feature
Retrium - Sprint retrospectives made easy and effective for distributed scrum teams.
Thumbnail Zoom Plus - The official site of the Thumbnail Zoom Plus add-on for Firefox
Parabol - Agile Meeting Co-Pilot