Opera 11 will have extensions.

Mozilla 1.0 had the first decent extension system in 2002, and since then Opera users have been begging for one and getting lame excuses and half-baked substitutes that offered none of the power of real extensions:  “Panels” were just HTML docs beside the viewport, and “widgets” just HTML apps in separate chromeless windows.

If Opera doesn’t want to sit at 1% market share for 10 more years, they better get this right. An “extension” system should be able to alter chrome and context menus at the bare minimum.