I found a great website that lists 150 popular Firefox extensions and checks if Opera offers their functionality as well. The main part of Rijks comparision consists of a table that has the 150 most popular (based on the most popular category on the mozilla firefox website) Firefox extensions on the left side and one of four possible results for Opera on the right side.
Results can be divided into four different categories each represented by its own color. The dark green category means that Opera has the functionality of the extension built in, green means a comparable addon is available as a widget or userscript; links are given in this category. Light green means the functionality is limited or that advanced customisation is needed to achieve the result. Red finally means that there is nothing like that available for Opera as of know.
I did check some of the plugins that I´am using and most are actually available for Opera as well. Let me list some that are in the dark green category: Video downloader, Faster Fox, Download Statusbar, Tab Mix Plus, Adblock, Session Saver and Linkification. Not much that I would actually be missing.
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