Extensions
Workspace Tab Counter
A tab counter specifically for GX, which counts tabs per workspace too.
Blendup
A tool for web developers to preview blend modes on different page elements.
KJMZ DA BLAZE
Listen KJMZ DA BLAZE Radio with Opera Browser.
InoReader Sidebar
Mobile version Inoreader.com on sidebar (not official)
Landmarks
Allows you to navigate a web page via WAI-ARIA landmarks, using the keyboard or a pop-up menu.
Headings, Landmarks and Links
View the headings, landmarks and links from a web page in a side panel and export information to CSV formated file.